runtime: amend doc for setPinned
Change-Id: I9c5a8f8a031e368bda312c830dc266f5986e8b1a
GitHub-Last-Rev:
23145e8fdbc020ae17503e3abe4fe230ba1082ef
GitHub-Pull-Request: golang/go#76160
Reviewed-on: https://go-review.googlesource.com/c/go/+/717341
Reviewed-by: Keith Randall <khr@golang.org>
Auto-Submit: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Pratt <mpratt@google.com>