minor #13473 Tag name updated (silverbackdan)

This PR was submitted for the 5.0 branch but it was merged into the 4.4 branch instead (closes #13473).

Discussion
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Tag name updated

In the entity listener section, the PHP config docs were using the event_listener tag instead.

Commits
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5577f7b Tag name updated

Author: javiereguiluz

doctrine/events.rst

@@ -312,7 +312,7 @@ with the ``doctrine.orm.entity_listener`` tag:
         use App\EventListener\UserChangedNotifier;
 
         $container->autowire(UserChangedNotifier::class)
-            ->addTag('doctrine.orm.event_listener', [
+            ->addTag('doctrine.orm.entity_listener', [
                 // these are the basic options that define the entity listener
                 'event' => 'postUpdate',
                 'entity' => User::class,