Update monolog_console.rst

[94noni]

Small PR to try to document symfony/monolog-bundle#446
I've came across and did not find any doc entry, for me this page is legit

@GromNaN allow me to ping you here and asking you some feedback

thx!

[GromNaN]

This will work only if the env var is used in monolog configuration. I would not mention this feature like this in the documentation, because we can do this kind of runtime configuration with almost any env var.

monolog:
    handlers:
        main:
            type: stream
            path: "%kernel.logs_dir%/%kernel.environment%.log"
            level: "%env(LOG_LEVEL)%"

[94noni]

@GromNaN oki lets close then, thx for answering