Update mercure.rst

Co-Authored-By: dunglas <[email protected]>

Author: javiereguiluz

mercure.rst

@@ -287,7 +287,7 @@ in a ``Link`` HTTP header.
 
 Symfony makes it easy to create ``Link`` headers thanks to
 :doc:`WebLink Component </web_link>`.
-Install it, then use it through the `AbstractController::addLink` helper method:
+Install it, then use it through the ``AbstractController::addLink`` helper method:
 
 .. code-block:: php