No docs about how to use app()->logger()

[Serge-45]

in src/docs/routing/error-handling.md
Description about how to install and configure the logger module is OK
But, missing explanation about how to use it for adding log entries, for instance :

app()->logger()->debug('log DEBUG');
app()->logger()->info('log INFO');
app()->logger()->critical('log CRITICAL');

Or maybe I missed it somewhere else...