Fixed a function comment. Change-Id: I1185c0c849abbb8244c6282fa6036fa6939c3309 Reviewed-on: https://go-review.googlesource.com/23971 Reviewed-by: Han-Wen Nienhuys <hanwen@google.com> Run-TryBot: Han-Wen Nienhuys <hanwen@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org>