log/syslog: document that this package no longer works after macOS 12.0

Per https://developer.apple.com/documentation/os/logging, Apple's syslog
no longer uses the legacy syslog and Apple System Logger (ASL) APIs
as of macOS 12.X (Monterey), 13.X (Ventura) and thus this package no
longer works and no longer listens on a UNIX domain socket, but it instead
uses Apple Unified Logging (AUL). With this package being frozen though,
the best that we can do is document this limitation.

Fixes #59229

Change-Id: Idd008d546705dfc751b170eddaf3c450e96c1dd6
Reviewed-on: https://go-review.googlesource.com/c/go/+/732640
Auto-Submit: Emmanuel Odeke <emmanuel@orijtech.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: David Chase <drchase@google.com>

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