Update mysql.conf sample

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@1289 65c4cc65-6c06-0410-ace0-fbb531ad65f3

configs/cdr_mysql.conf.sample

+;
+; Note - if the database server is hosted on the same machine as the
+; asterisk server, you can achieve a local Unix socket connection by
+; setting hostname=localhost
+;
 ;[global]
 ;hostname=database.host.name
 ;dbname=asteriskcdrdb