[Docs] List out log levels in documentation

[mbalc]

Issue Summary

Documentation lacks a list of allowed values for logging 'level' configuration description (only describing two examples).

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Were this in place, it would save a lot of time, because I wouldn't have assumed that info is the lowest possible level.

I would implement this myself, making a pull request for this file and line, were the documentation not closed source.

Code of Conduct

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[georgeolson92]

Hello, I'm new to the code base and looking to collaborate, would love to help get this implemented if it hasn't been addressed already!

[Muhammad-Owais-Warsi]

Hey, I would love to collaborate if it hasn't already been addressed by someone else. Thanks :)