Remove XML configuration example

Author: javiereguiluz

messenger.rst

@@ -2052,22 +2052,6 @@ To enable message signing for your handler, set the ``sign`` option to ``true``:
                 tags:
                     - { name: messenger.message_handler, sign: true }
 
-    .. code-block:: xml
-
-        <!-- config/services.xml -->
-        <?xml version="1.0" encoding="UTF-8" ?>
-        <container xmlns="http://symfony.com/schema/dic/services"
-            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-            xsi:schemaLocation="http://symfony.com/schema/dic/services
-                https://symfony.com/schema/dic/services/services-1.0.xsd">
-
-            <services>
-                <service id="App\MessageHandler\SmsNotificationHandler">
-                    <tag name="messenger.message_handler" sign="true"/>
-                </service>
-            </services>
-        </container>
-
     .. code-block:: php
 
         // config/services.php