Added information about injecting a logger to your service

Reverted whitespace

Fixed unclear sentence about the Monolog logger tag

Fixed committed whitespace

Author: hiddewie

logging.rst

@@ -308,6 +308,15 @@ option of your handler to ``rotating_file``:
             ),
         ));
 
+Injecting a Logger into a Service
+----------------------------------
+
+To use a logger in your own service, inject it using Dependency Injection
+with ``@logger``. If you want to use a pre-configured logger which uses a
+specific channel (``app`` by default), use the ``monolog.logger`` tag with the
+``channel`` property. Look at the :ref:`Dependency Injection reference
+<dic_tags-monolog>` for more information and an example.
+
 Adding extra Data to each Log (e.g. a unique request token)
 -----------------------------------------------------------