minor #11812 Update logging/channels_handlers.rst to show private monolog services (Mynyx)

This PR was merged into the 3.4 branch.

Discussion
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Update logging/channels_handlers.rst to show private monolog services

The command `php bin/console debug:container` without parameters shows only public services. Therefore the parameter monolog is necessary.

Commits
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b1639c7 Update channels_handlers.rst

Author: javiereguiluz

logging/channels_handlers.rst

@@ -15,8 +15,8 @@ the channel).
 .. note::
 
     Each channel corresponds to a logger service (``monolog.logger.XXX``)
-    in the container (use the ``debug:container`` command to see a full list)
-    and those are injected into different services.
+    in the container (use the ``php bin/console debug:container monolog`` command
+    to see a full list) and those are injected into different services.
 
 .. _logging-channel-handler: