More clearly explain that quote marks are no longer necessary.

(closes issue #13718)
 Reported by: davidw
 Patches: 
       20081020__bug13718.diff.txt uploaded by Corydon76 (license 14)
 Tested by: blitzrage


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@167176 65c4cc65-6c06-0410-ace0-fbb531ad65f3