As CL 569755 did, for consistency, this CL slightly improves
the documentation for RuneLen.
Change-Id: Ic9776648baf2809af36cd16a94d1313938bb0e52
Reviewed-on: https://go-review.googlesource.com/c/go/+/569816
Auto-Submit: Ian Lance Taylor <iant@google.com> Reviewed-by: Michael Knyszek <mknyszek@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Ian Lance Taylor <iant@google.com>
Commit-Queue: Ian Lance Taylor <iant@google.com>