Update the example doc to include the event, not the listener (#9109)

Author: JadoJodo

events.md

@@ -330,7 +330,7 @@ If you would like to define the listener's queue connection, queue name, or dela
     /**
      * Get the number of seconds before the job should be processed.
      */
-    public function withDelay(SendShipmentNotification $event): int
+    public function withDelay(OrderShipped $event): int
     {
         return $event->highPriority ? 0 : 60;
     }