lint fix

Author: ne0-cz

frontend/encore/dev-server.rst

@@ -129,7 +129,7 @@ your page. HMR works automatically with CSS (as long as you're using the
 (like :doc:`Vue.js </frontend/encore/vuejs>`).
 
 Live Reloading when changing PHP / Twig Files
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 To utilize the HMR superpower along with live reload for your PHP code and
 templates, set the following options: