Setting the logger_config config is no longer needed

monolog/README.md

@@ -3,12 +3,3 @@
 A Logging framework with lots of additions (see [Monolog](https://github.com/Seldaek/monolog/)). There are just Friendica additions inside the src directory.
 
 Set `system.logger_config` to `monolog` in your `config/local.config.php` file to activate Monolog.
-
-```
-// in config/local.config.php
-// ...
-    'system' => [
-        'logger_config' => 'monolog',
-    ]
-// ...
-```