Link AfterEvent to SF's Event

As this is outside the actual PHP API Ref Ibexa\Contracts scope, this isn't documented. This @link can help by linking to SF repo.

src/contracts/Repository/Event/AfterEvent.php

@@ -12,6 +12,8 @@
 
 /**
  * Event emitted after action execution.
+ *
+ * @link https://github.com/symfony/symfony/blob/5.4/src/Symfony/Contracts/EventDispatcher/Event.php Symfony\Contracts\EventDispatcher\Event
  */
 abstract class AfterEvent extends Event
 {