minor #10049 Mention how to inject a specific Monolog service (javiereguiluz)

This PR was merged into the 3.4 branch.

Discussion
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Mention how to inject a specific Monolog service

This replaces #9849 and links to the explanation about how to wire specific services in the container.

Commits
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391d3e0 Mention how to inject a specific Monolog service

Author: javiereguiluz

logging/channels_handlers.rst

@@ -169,5 +169,7 @@ You can also configure additional channels without the need to tag your services
             ),
         ));
 
-With this, you can now send log messages to the ``foo`` channel by using
-the automatically registered logger service ``monolog.logger.foo``.
+Symfony automatically registers one service per channel (in this example, the
+channel ``foo`` creates a service called ``monolog.logger.foo``). In order to
+inject this service into others, you must update the service configuration to
+:ref:`choose the specific service to inject <services-wire-specific-service>`.