fix remaining documentation links PiperOrigin-RevId: 707545732 Change-Id: I7884743d0e4d0424a39e79a975827baafda14278 Reviewed-on: https://go-review.googlesource.com/c/open2opaque/+/637435 Auto-Submit: Michael Stapelberg <stapelberg@google.com> Reviewed-by: Michael Stapelberg <stapelberg@google.com> Reviewed-by: Chressie Himpel <chressie@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>