add comment warning people about trying to use hostnames/IPs in the sample config

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.2@10736 65c4cc65-6c06-0410-ace0-fbb531ad65f3

configs/iax.conf.sample

@@ -333,6 +333,11 @@ inkeys=freeworlddialup
 ; keys should always be 3DES encrypted.
 ;
 ;
+; NOTE: All hostnames and IP addresses in this file are for example purposes
+;       only; you should not expect any of them to actually be available for
+;       your use.
+;
+;
 ;[markster]
 ;type=user
 ;context=default