fix little typo

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@4233 65c4cc65-6c06-0410-ace0-fbb531ad65f3

configs/agents.conf.sample

@@ -11,7 +11,7 @@
 ;autologoff=15
 ;
 ; Define ackcall to require an acknowledgement by '#' when
-; an agent logs in over agentcallpark.  Default is "yes".
+; an agent logs in using agentcallbacklogin.  Default is "yes".
 ;
 ;ackcall=yes
 ;