cmd/vet: little tweak to tagged literal script to get it closer to drop-in format.
cmd/vet: little tweak to tagged literal script to get it closer to drop-in format.

This is a minor change that made it easier for me; if you hate it I can drop it.

R=nigeltao
CC=golang-dev
http://codereview.appspot.com/5798060
abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go