Merge branch '4.4' of github.com:symfony/symfony-docs into 4.4

* '4.4' of github.com:symfony/symfony-docs:
  [#14422] Minor change in sentence
  Adding information to the monolog autowire documentation that specifies that the channel must be defined

Author: javiereguiluz

logging/channels_handlers.rst

@@ -182,8 +182,11 @@ How to Autowire Logger Channels
 
 Starting from `MonologBundle`_ 3.5 you can autowire different Monolog channels
 by type-hinting your service arguments with the following syntax:
-``Psr\Log\LoggerInterface $<channel>Logger``. For example, to inject the service
-related to the ``app`` logger channel use this:
+``Psr\Log\LoggerInterface $<channel>Logger``. The ``<channel>`` must have been
+:ref:`predefined in your Monolog configuration <monolog-channels-config>`.
+
+For example to inject the service related to the ``app`` logger channel,
+change your constructor like this:
 
 .. code-block:: diff