fix a typo

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@5273 65c4cc65-6c06-0410-ace0-fbb531ad65f3

UPGRADE.txt

@@ -14,7 +14,7 @@ Dialing:
   called, rather than the Caller*ID of the inbound leg of the call.  The 
   "o" flag for Dial can be used to restore the original behavior if 
   desired.  Note that if you are looking for the originating callerid
-  from the manager event there is a new manager even "Dial" which 
+  from the manager event, there is a new manager event "Dial" which 
   provides the source and destination channels and callerid.
 
 IAX: