Minor extensions.conf update

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@779 65c4cc65-6c06-0410-ace0-fbb531ad65f3

configs/extensions.conf.sample

@@ -149,7 +149,7 @@ include => parkedcalls
 include => trunklocal
 include => iaxtel700
 include => trunktollfree
-include => provider
+include => iaxprovider
 ;
 ; You can use an alternative switch type as well, to resolve
 ; extensions that are not known here, for example with remote