Update processors.rst

Author: marcinowski

logging/processors.rst

@@ -165,7 +165,7 @@ handler level or at the channel level instead of registering it globally
         The autoconfiguration of Monolog processors was introduced in Monolog bundle 2.4.
 
     If you're using the :ref:`default services.yaml configuration <service-container-services-load-example>`,
-    processors implementing :class:`Monolog\\Processor\\ProcessorInterface`
+    processors implementing ProcessorInterface_
     are automatically registered as services and tagged with ``monolog.processor``,
     so you can use them without adding any configuration. The same applies to the
     built-in :class:`Symfony\\Bridge\\Monolog\\Processor\\TokenProcessor` and
@@ -298,3 +298,5 @@ the ``monolog.processor`` tag:
         $container
             ->register(SessionRequestProcessor::class)
             ->addTag('monolog.processor', array('channel' => 'main'));
+
+.. _ProcessorInterface: https://github.com/Seldaek/monolog/blob/master/src/Monolog/Processor/ProcessorInterface.php