misc/vim: "PACKAGE DOCUMENTATION" is not hilighted
misc/vim: "PACKAGE DOCUMENTATION" is not hilighted

R=golang-dev, r, dsymonds
CC=golang-dev
https://codereview.appspot.com/14018043

Committer: David Symonds <7f6bb564ed9e580d4f0aa90d53b34578e5d24cb9@golang.org>

h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang