minor #50594 [DoctrineBridge] Remove (wrong) PHPDoc on `ContainerAwar…

…eEventManager` (alexandre-daubois)

This PR was merged into the 6.3 branch.

Discussion
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[DoctrineBridge] Remove (wrong) PHPDoc on `ContainerAwareEventManager`

| Q             | A
| ------------- | ---
| Branch?       | 6.3
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Tickets       | -
| License       | MIT
| Doc PR        | -

This PR is a follow-up of the following discussion: #50575 (comment)

Commits
-------

d65db40 [DoctrineBridge] Remove (wrong) PHPDoc on `ContainerAwareEventManager`

src/Symfony/Bridge/Doctrine/ContainerAwareEventManager.php

@@ -63,9 +63,6 @@ public function dispatchEvent($eventName, EventArgs $eventArgs = null): void
         }
     }
 
-    /**
-     * @return object[][]
-     */
     public function getListeners($event = null): array
     {
         if (null === $event) {