Merge branch '5.4' into 6.2

* 5.4:
  Fix htaccess sample to use index.php instead of app.php
  [Form] Fix form events phpdocs

Author: derrabus

ServerBag.php

@@ -49,7 +49,7 @@ public function getHeaders(): array
              * RewriteCond %{HTTP:Authorization} .+
              * RewriteRule ^ - [E=HTTP_AUTHORIZATION:%0]
              * RewriteCond %{REQUEST_FILENAME} !-f
-             * RewriteRule ^(.*)$ app.php [QSA,L]
+             * RewriteRule ^(.*)$ index.php [QSA,L]
              */
 
             $authorizationHeader = null;