minor symfony#12839 Update event_dispatcher.rst (atailouloute)

This PR was submitted for the 5.0 branch but it was merged into the 4.3 branch instead (closes symfony#12839).

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Update event_dispatcher.rst

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20520f2 Update event_dispatcher.rst

Author: javiereguiluz

components/event_dispatcher.rst

@@ -404,7 +404,7 @@ from being called. In other words, the listener needs to be able to tell
 the dispatcher to stop all propagation of the event to future listeners
 (i.e. to not notify any more listeners). This can be accomplished from
 inside a listener via the
-:method:`Symfony\\Component\\EventDispatcher\\Event::stopPropagation` method::
+:method:`Symfony\\Contracts\\EventDispatcher\\Event::stopPropagation` method::
 
     use Acme\Store\Event\OrderPlacedEvent;