all: use "reports whether" consistently instead of "returns whether"

Follow-up for CL 147037 and after Brad noticed the "returns whether"
pattern during the review of CL 150621.

Go documentation style for boolean funcs is to say:

    // Foo reports whether ...
    func Foo() bool

(rather than "returns whether")

Created with:

    $ perl -i -npe 's/returns whether/reports whether/' $(git grep -l "returns whether" | grep -v vendor)

Change-Id: I15fe9ff99180ad97750cd05a10eceafdb12dc0b4
Reviewed-on: https://go-review.googlesource.com/c/150918
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/runtime/trace/annotation.go b/src/runtime/trace/annotation.go
index d5a7d003fe..82cb232dba 100644
--- a/src/runtime/trace/annotation.go
+++ b/src/runtime/trace/annotation.go
@@ -171,7 +171,7 @@ func (r *Region) End() {
 	userRegion(r.id, regionEndCode, r.regionType)
 }
 
-// IsEnabled returns whether tracing is enabled.
+// IsEnabled reports whether tracing is enabled.
 // The information is advisory only. The tracing status
 // may have changed by the time this function returns.
 func IsEnabled() bool {