minor #4316 Remove horizontal scrollbar (ifdattic)

This PR was merged into the 2.4 branch.

Discussion
----------

Remove horizontal scrollbar

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | 2.4
| Fixed tickets |

Commits
-------

53638a6 Remove horizontal scrollbar

Author: wouterj

Diff for: components/event_dispatcher/introduction.rst

@@ -509,8 +509,11 @@ Lazy loading listeners::
     {
         private $started = false;
 
-        public function myLazyListener(Event $event, $eventName, EventDispatcherInterface $dispatcher)
-        {
+        public function myLazyListener(
+            Event $event,
+            $eventName,
+            EventDispatcherInterface $dispatcher
+        ) {
             if (false === $this->started) {
                 $subscriber = new StoreSubscriber();
                 $dispatcher->addSubscriber($subscriber);
@@ -529,8 +532,11 @@ Dispatching another event from within a listener::
 
     class Foo
     {
-        public function myFooListener(Event $event, $eventName, EventDispatcherInterface $dispatcher)
-        {
+        public function myFooListener(
+            Event $event,
+            $eventName,
+            EventDispatcherInterface $dispatcher
+        ) {
             $dispatcher->dispatch('log', $event);
 
             // ... more code