spec: Fix a code tag
spec: Fix a code tag

R=golang-dev, gri
CC=golang-dev
http://codereview.appspot.com/1266042

Committer: Robert Griesemer <a6752097faebf1f02d80107d77a9be009089afe3@golang.org>
abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go