minor #17541 [Routing] Fix link text (HypeMC)

This PR was merged into the 5.4 branch.

Discussion
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[Routing] Fix link text

Introduced in #17521 .

[![image](https://user-images.githubusercontent.com/2445045/206602923-733369ea-3e69-4084-815b-26d8a2583d6f.png)](https://symfony.com/doc/5.4/routing.html#creating-routes-in-yaml-xml-or-php-files)

Commits
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4addacd [Routing] Fix link text

Author: OskarStark

routing.rst

@@ -187,7 +187,7 @@ the ``BlogController``:
 
     By default Symfony only loads the routes defined in YAML format. If you
     define routes in XML and/or PHP formats, you need to
-    :ref:`update the ``src/Kernel.php`` file <configuration-formats>`.
+    :ref:`update the src/Kernel.php file <configuration-formats>`.
 
 .. _routing-matching-http-methods: