Fix docs on RT::Queue::IsWatcher

The documentation incorrectly states that it can check for the Type of
Owner and Requestor, but the method cannot.

The incorrect documentation was copied from RT::Ticket, which does have
those Types.

lib/RT/Queue.pm

@@ -664,19 +664,17 @@ sub AdminCc {
 }
 
 
-
-# a generic routine to be called by IsRequestor, IsCc and IsAdminCc
+# a generic routine to be called by IsCc and IsAdminCc
 
 =head2 IsWatcher { Type => TYPE, PrincipalId => PRINCIPAL_ID }
 
-Takes a param hash with the attributes Type and PrincipalId
-
-Type is one of Requestor, Cc, AdminCc and Owner
+Takes a param hash with the attributes Type and PrincipalId.
 
-PrincipalId is an RT::Principal id 
+Type is one of Cc or AdminCc.
 
-Returns true if that principal is a member of the group Type for this queue
+PrincipalId is an RT::Principal id.
 
+Returns true if that principal is a member of the group Type for this queue.
 
 =cut
 
@@ -702,8 +700,6 @@ sub IsWatcher {
 }
 
 
-
-
 =head2 IsCc PRINCIPAL_ID
 
 Takes an RT::Principal id.