minor #14601 [EventDispatcher] Update event_dispatcher.rst (concilioinvest)

This PR was merged into the 4.4 branch.

Discussion
----------

[EventDispatcher] Update event_dispatcher.rst

It must be the `tag` method.

<!--

If your pull request fixes a BUG, use the oldest maintained branch that contains
the bug (see https://symfony.com/releases for the list of maintained branches).

If your pull request documents a NEW FEATURE, use the same Symfony branch where
the feature was introduced (and `5.x` for features of unreleased versions).

-->

Commits
-------

17f9fbf Update event_dispatcher.rst

Author: javiereguiluz

event_dispatcher.rst

@@ -109,7 +109,7 @@ using a special "tag":
         use App\EventListener\ExceptionListener;
 
         $container->register(ExceptionListener::class)
-            ->addTag('kernel.event_listener', ['event' => 'kernel.exception'])
+            ->tag('kernel.event_listener', ['event' => 'kernel.exception'])
         ;
 
 Symfony follows this logic to decide which method to call inside the event