Add event fake documentation for times dispatched

mocking.md

@@ -79,6 +79,10 @@ As an alternative to mocking, you may use the `Event` facade's `fake` method to
                 return $e->order->id === $order->id;
             });
 
+            // Assert an event was dispatched twice...
+            Event::assertDispatched(OrderShipped::class, 2);
+
+            // Assert an event was not dispatched...
             Event::assertNotDispatched(OrderFailedToShip::class);
         }
     }