add documentation for check_state_unknown in configs/queues.conf.sample

app_queue allows calls to members in a "Unknown" state to be treated as available
setting check_state_unknown = yes will cause app_queue to query the channel driver
to better determine the state this only applies to queues with ringinuse or ignorebusy
set appropriately. 



git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/10@341599 65c4cc65-6c06-0410-ace0-fbb531ad65f3

configs/queues.conf.sample

@@ -65,6 +65,13 @@ monitor-type = MixMonitor
 ;
 ;negative_penalty_invalid = no
 ;
+; app_queue allows calls to members in a "Unknown" state to be treated as available
+; setting check_state_unknown = yes will cause app_queue to query the channel driver
+; to better determine the state this only applies to queues with ringinuse or ignorebusy
+; set appropriately. 
+;
+;check_state_unknown = no
+;
 ;[markq]
 ;
 ; A sample call queue