remove reference to missing foo_bar logger

Author: alexislefebvre

logging/channels_handlers.rst

@@ -180,7 +180,7 @@ by type-hinting your service arguments with the following syntax:
 ``Psr\Log\LoggerInterface $<camelCased channel name> + Logger``. The ``<channel>``
 must have been :ref:`predefined in your Monolog configuration <monolog-channels-config>`.
 
-For example to inject the service related to the ``foo_bar`` logger channel,
+For example to inject the service related to the ``foo`` logger channel,
 change your constructor like this:
 
 .. code-block:: diff