all: single space after period.

The tree's pretty inconsistent about single space vs double space
after a period in documentation. Make it consistently a single space,
per earlier decisions. This means contributors won't be confused by
misleading precedence.

This CL doesn't use go/doc to parse. It only addresses // comments.
It was generated with:

$ perl -i -npe 's,^(\s*// .+[a-z]\.)  +([A-Z]),$1 $2,' $(git grep -l -E '^\s*//(.+\.)  +([A-Z])')
$ go test go/doc -update

Change-Id: Iccdb99c37c797ef1f804a94b22ba5ee4b500c4f7
Reviewed-on: https://go-review.googlesource.com/20022
Reviewed-by: Rob Pike <r@golang.org>
Reviewed-by: Dave Day <djd@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

12 files changed, 19 insertions, 19 deletions

diff --git a/src/cmd/internal/obj/arm/asm5.go b/src/cmd/internal/obj/arm/asm5.go
index d75a16354c..9da33bc854 100644
--- a/src/cmd/internal/obj/arm/asm5.go
+++ b/src/cmd/internal/obj/arm/asm5.go
@@ -2372,7 +2372,7 @@ func asmout(ctxt *obj.Link, p *obj.Prog, o *Optab, out []uint32) {
 
 		// This is supposed to be something that stops execution.
 	// It's not supposed to be reached, ever, but if it is, we'd
-	// like to be able to tell how we got there.  Assemble as
+	// like to be able to tell how we got there. Assemble as
 	// 0xf7fabcfd which is guaranteed to raise undefined instruction
 	// exception.
 	case 96: /* UNDEF */
diff --git a/src/cmd/internal/obj/arm64/a.out.go b/src/cmd/internal/obj/arm64/a.out.go
index f459483cce..ab05894950 100644
--- a/src/cmd/internal/obj/arm64/a.out.go
+++ b/src/cmd/internal/obj/arm64/a.out.go
@@ -1,14 +1,14 @@
 // cmd/7c/7.out.h  from Vita Nuova.
 // https://code.google.com/p/ken-cc/source/browse/src/cmd/7c/7.out.h
 //
-// 	Copyright © 1994-1999 Lucent Technologies Inc.  All rights reserved.
+// 	Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
 // 	Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
 // 	Portions Copyright © 1997-1999 Vita Nuova Limited
 // 	Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
 // 	Portions Copyright © 2004,2006 Bruce Ellis
 // 	Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
 // 	Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
-// 	Portions Copyright © 2009 The Go Authors.  All rights reserved.
+// 	Portions Copyright © 2009 The Go Authors. All rights reserved.
 //
 // Permission is hereby granted, free of charge, to any person obtaining a copy
 // of this software and associated documentation files (the "Software"), to deal
@@ -167,7 +167,7 @@ const (
 )
 
 // Not registers, but flags that can be combined with regular register
-// constants to indicate extended register conversion.  When checking,
+// constants to indicate extended register conversion. When checking,
 // you should subtract obj.RBaseARM64 first. From this difference, bit 11
 // indicates extended register, bits 8-10 select the conversion mode.
 const REG_EXT = obj.RBaseARM64 + 1<<11
diff --git a/src/cmd/internal/obj/arm64/asm7.go b/src/cmd/internal/obj/arm64/asm7.go
index 162acd2555..2b0a9cc287 100644
--- a/src/cmd/internal/obj/arm64/asm7.go
+++ b/src/cmd/internal/obj/arm64/asm7.go
@@ -1,14 +1,14 @@
 // cmd/7l/asm.c, cmd/7l/asmout.c, cmd/7l/optab.c, cmd/7l/span.c, cmd/ld/sub.c, cmd/ld/mod.c, from Vita Nuova.
 // https://code.google.com/p/ken-cc/source/browse/
 //
-// 	Copyright © 1994-1999 Lucent Technologies Inc.  All rights reserved.
+// 	Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
 // 	Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
 // 	Portions Copyright © 1997-1999 Vita Nuova Limited
 // 	Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
 // 	Portions Copyright © 2004,2006 Bruce Ellis
 // 	Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
 // 	Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
-// 	Portions Copyright © 2009 The Go Authors.  All rights reserved.
+// 	Portions Copyright © 2009 The Go Authors. All rights reserved.
 //
 // Permission is hereby granted, free of charge, to any person obtaining a copy
 // of this software and associated documentation files (the "Software"), to deal
@@ -2811,7 +2811,7 @@ func asmout(ctxt *obj.Link, p *obj.Prog, o *Optab, out []uint32) {
 
 	// This is supposed to be something that stops execution.
 	// It's not supposed to be reached, ever, but if it is, we'd
-	// like to be able to tell how we got there.  Assemble as
+	// like to be able to tell how we got there. Assemble as
 	// 0xbea71700 which is guaranteed to raise undefined instruction
 	// exception.
 	case 90:
diff --git a/src/cmd/internal/obj/arm64/list7.go b/src/cmd/internal/obj/arm64/list7.go
index 53d67c91bb..36f544b53a 100644
--- a/src/cmd/internal/obj/arm64/list7.go
+++ b/src/cmd/internal/obj/arm64/list7.go
@@ -1,14 +1,14 @@
 // cmd/7l/list.c and cmd/7l/sub.c from Vita Nuova.
 // https://code.google.com/p/ken-cc/source/browse/
 //
-// 	Copyright © 1994-1999 Lucent Technologies Inc.  All rights reserved.
+// 	Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
 // 	Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
 // 	Portions Copyright © 1997-1999 Vita Nuova Limited
 // 	Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
 // 	Portions Copyright © 2004,2006 Bruce Ellis
 // 	Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
 // 	Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
-// 	Portions Copyright © 2009 The Go Authors.  All rights reserved.
+// 	Portions Copyright © 2009 The Go Authors. All rights reserved.
 //
 // Permission is hereby granted, free of charge, to any person obtaining a copy
 // of this software and associated documentation files (the "Software"), to deal
diff --git a/src/cmd/internal/obj/arm64/obj7.go b/src/cmd/internal/obj/arm64/obj7.go
index 93c4b1a6b8..a4487d0125 100644
--- a/src/cmd/internal/obj/arm64/obj7.go
+++ b/src/cmd/internal/obj/arm64/obj7.go
@@ -1,14 +1,14 @@
 // cmd/7l/noop.c, cmd/7l/obj.c, cmd/ld/pass.c from Vita Nuova.
 // https://code.google.com/p/ken-cc/source/browse/
 //
-// 	Copyright © 1994-1999 Lucent Technologies Inc.  All rights reserved.
+// 	Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
 // 	Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
 // 	Portions Copyright © 1997-1999 Vita Nuova Limited
 // 	Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
 // 	Portions Copyright © 2004,2006 Bruce Ellis
 // 	Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
 // 	Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
-// 	Portions Copyright © 2009 The Go Authors.  All rights reserved.
+// 	Portions Copyright © 2009 The Go Authors. All rights reserved.
 //
 // Permission is hereby granted, free of charge, to any person obtaining a copy
 // of this software and associated documentation files (the "Software"), to deal
diff --git a/src/cmd/internal/obj/link.go b/src/cmd/internal/obj/link.go
index 4ae819178d..53a8fa3334 100644
--- a/src/cmd/internal/obj/link.go
+++ b/src/cmd/internal/obj/link.go
@@ -460,7 +460,7 @@ const (
 	// have the inherent issue that a 32-bit (or 64-bit!) displacement cannot be
 	// stuffed into a 32-bit instruction, so an address needs to be spread across
 	// several instructions, and in turn this requires a sequence of relocations, each
-	// updating a part of an instruction.  This leads to relocation codes that are
+	// updating a part of an instruction. This leads to relocation codes that are
 	// inherently processor specific.
 
 	// Arm64.
diff --git a/src/cmd/internal/obj/objfile.go b/src/cmd/internal/obj/objfile.go
index ced1e842e0..7ff9fcaa91 100644
--- a/src/cmd/internal/obj/objfile.go
+++ b/src/cmd/internal/obj/objfile.go
@@ -108,7 +108,7 @@ import (
 )
 
 // The Go and C compilers, and the assembler, call writeobj to write
-// out a Go object file.  The linker does not call this; the linker
+// out a Go object file. The linker does not call this; the linker
 // does not write out object files.
 func Writeobjdirect(ctxt *Link, b *Biobuf) {
 	Flushplist(ctxt)
diff --git a/src/cmd/internal/obj/ppc64/obj9.go b/src/cmd/internal/obj/ppc64/obj9.go
index 11be4d79f6..c747138ece 100644
--- a/src/cmd/internal/obj/ppc64/obj9.go
+++ b/src/cmd/internal/obj/ppc64/obj9.go
@@ -953,7 +953,7 @@ func stacksplit(ctxt *obj.Link, p *obj.Prog, framesize int32) *obj.Prog {
 	}
 
 	if ctxt.Flag_dynlink {
-		// Avoid calling morestack via a PLT when dynamically linking.  The
+		// Avoid calling morestack via a PLT when dynamically linking. The
 		// PLT stubs generated by the system linker on ppc64le when "std r2,
 		// 24(r1)" to save the TOC pointer in their callers stack
 		// frame. Unfortunately (and necessarily) morestack is called before
diff --git a/src/cmd/internal/obj/textflag.go b/src/cmd/internal/obj/textflag.go
index cf742a5218..57ecea334c 100644
--- a/src/cmd/internal/obj/textflag.go
+++ b/src/cmd/internal/obj/textflag.go
@@ -3,7 +3,7 @@
 // license that can be found in the LICENSE file.
 
 // This file defines flags attached to various functions
-// and data objects.  The compilers, assemblers, and linker must
+// and data objects. The compilers, assemblers, and linker must
 // all agree on these values.
 
 package obj
@@ -14,7 +14,7 @@ const (
 	// Deprecated: Not implemented, do not use.
 	NOPROF = 1
 
-	// It is ok for the linker to get multiple of these symbols.  It will
+	// It is ok for the linker to get multiple of these symbols. It will
 	// pick one of the duplicates to use.
 	DUPOK = 2
 
diff --git a/src/cmd/internal/obj/util.go b/src/cmd/internal/obj/util.go
index 29768e0dd1..a1c1cca895 100644
--- a/src/cmd/internal/obj/util.go
+++ b/src/cmd/internal/obj/util.go
@@ -553,7 +553,7 @@ const (
 )
 
 // RegisterRegister binds a pretty-printer (Rconv) for register
-// numbers to a given register number range.  Lo is inclusive,
+// numbers to a given register number range. Lo is inclusive,
 // hi exclusive (valid registers are lo through hi-1).
 func RegisterRegister(lo, hi int, Rconv func(int) string) {
 	regSpace = append(regSpace, regSet{lo, hi, Rconv})
diff --git a/src/cmd/internal/obj/x86/asm6.go b/src/cmd/internal/obj/x86/asm6.go
index 9ab6615e43..c4f2140e9c 100644
--- a/src/cmd/internal/obj/x86/asm6.go
+++ b/src/cmd/internal/obj/x86/asm6.go
@@ -2285,7 +2285,7 @@ func oclass(ctxt *obj.Link, p *obj.Prog, a *obj.Addr) int {
 				}
 			case obj.NAME_AUTO, obj.NAME_PARAM:
 				// These names must have a base of SP.  The old compiler
-				// uses 0 for the base register.  SSA uses REG_SP.
+				// uses 0 for the base register. SSA uses REG_SP.
 				if a.Reg != REG_SP && a.Reg != 0 {
 					return Yxxx
 				}
diff --git a/src/cmd/internal/obj/x86/obj6.go b/src/cmd/internal/obj/x86/obj6.go
index 3f8426ae38..a553c94b8b 100644
--- a/src/cmd/internal/obj/x86/obj6.go
+++ b/src/cmd/internal/obj/x86/obj6.go
@@ -610,7 +610,7 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym) {
 
 	var bpsize int
 	if p.Mode == 64 && obj.Framepointer_enabled != 0 && autoffset > 0 {
-		// Make room for to save a base pointer.  If autoffset == 0,
+		// Make room for to save a base pointer. If autoffset == 0,
 		// this might do something special like a tail jump to
 		// another function, so in that case we omit this.
 		bpsize = ctxt.Arch.Ptrsize