fix a comment

sql/mysqld.cc

@@ -1691,7 +1691,7 @@ static void close_connections(void)
   {
     DBUG_PRINT("quit",("Informing thread %ld that it's time to die",
 		       (ulong) tmp->thread_id));
-    /* We skip slave threads & scheduler on this first loop through. */
+    /* We skip slave threads on this first loop through. */
     if (tmp->slave_thread)
       continue;