comment: change slice to string in function comment/help
Comment is outdated, it should say a string is returned
Change-Id: I7d40135aac22845dbc1f91e02e5776cc7d58eda7
GitHub-Last-Rev:
08ee556f0803dc0e2a765d431ac10758b4f26146
GitHub-Pull-Request: golang/go#75980
Reviewed-on: https://go-review.googlesource.com/c/go/+/713040
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Robert Griesemer <gri@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
Reviewed-by: Keith Randall <khr@google.com>