misc/vim: highlight misspelled words only in comments
misc/vim: highlight misspelled words only in comments

R=adg
CC=golang-dev
http://codereview.appspot.com/1915043

Committer: Andrew Gerrand <395a7d33bec8475c9b83b7d440f141bcbd994aa5@golang.org>

tav/go,tav/go,tav/go,tav/go,tav/go,tav/go,tav/go