minor symfony#12694 Fix filename (gisostallenberg)

This PR was merged into the 4.3 branch.

Discussion
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Fix filename

The filename in comment does not match the class name.

Commits
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26ebb90 Fix filename

Author: OskarStark

session/locale_sticky_session.rst

@@ -142,7 +142,7 @@ locale value before they are redirected to their first page.
 To do this, you need an event subscriber on the ``security.interactive_login``
 event::
 
-    // src/EventSubscriber/UserLocaleListener.php
+    // src/EventSubscriber/UserLocaleSubscriber.php
     namespace App\EventSubscriber;
 
     use Symfony\Component\EventDispatcher\EventSubscriberInterface;