Minor reword

Author: javiereguiluz

templating/twig_extension.rst

@@ -70,7 +70,8 @@ Next, register your class as a service and tag it with ``twig.extension``. If yo
 using the :ref:`default services.yaml configuration <service-container-services-load-example>`,
 you're done! Symfony will automatically know about your new service and add the tag.
 
-Execute this command to verify if your new filter was successfully registered:
+Optionally, execute this command to confirm that your new filter was
+successfully registered:
 
 .. code-block:: terminal