Fix wgs mentions

templates/agenda.tt

@@ -20,10 +20,10 @@ tags: prioritization, rustc
 
 ### WG checkins
 
-@**WG-X** checkin by @**person1**:
+@*WG-X* checkin by @**person1**:
 > Checkin text
 
-@**WG-Y** checkin by @**person2**:
+@*WG-Y* checkin by @**person2**:
 > Checkin text
 
 ## Beta-nominations