cmd/link: document that -s implies -w
Existing documentation does not reference implicit behavior.
Updates the documentation to reflect that -s implies -w.
Fixes #71051
Change-Id: I5c139c37f5f78596365e38479be4c865a4d4dd62
GitHub-Last-Rev:
a3e462c4168284529ea1b0d03bc25fb1c12f1da5
GitHub-Pull-Request: golang/go#71053
Reviewed-on: https://go-review.googlesource.com/c/go/+/638976
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Auto-Submit: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>