[8.x] Add assertListening To Comment Section For IDEs Autocomplete (#38488)

Now we won't be able to use assertListening in IDEs autocomplete.
With this change, we will be able to use this method with autocomplete.

Author: reziamini

src/Illuminate/Support/Facades/Event.php

@@ -16,6 +16,7 @@
  * @method static void assertDispatched(string|\Closure $event, callable|int $callback = null)
  * @method static void assertDispatchedTimes(string $event, int $times = 1)
  * @method static void assertNotDispatched(string|\Closure $event, callable|int $callback = null)
+ * @method static void assertListening(string $expectedEvent, string expectedListener)
  * @method static void flush(string $event)
  * @method static void forget(string $event)
  * @method static void forgetPushed()