misc/vim: clarifies syntax highlighting installation instructions
misc/vim: clarifies syntax highlighting installation instructions

Based on the review of CL 1723044, I've changed the installation instructions
for the vim syntax files to suggest symlinking the files rather than copying
the files. Also the wording has changed to be more consistent.

R=golang-dev, Kyle Lemons, adg
CC=golang-dev
http://codereview.appspot.com/1702045

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

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