Update queues.conf.sample documentation.

Update the queues.conf.sample documentation to mention that you need to preload chan_local.so as well if you plan on using Local channels for queue members, and you're preloading pbx_config.so.


(closes issue #14179)
Reported by: CrashHD
Tested by: CrashHD

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@167477 65c4cc65-6c06-0410-ace0-fbb531ad65f3