rename to more clearly state what this file shows how to do

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@40257 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/doc/queues.txt b/doc/queues-with-callback-members.txt
similarity index 100%
rename from doc/queues.txt
rename to doc/queues-with-callback-members.txt