Contributor Doc Updates

[sco1]

For review prior to pushing to individual projects, updated verbiage related to our logging levels.

See: https://github.com/python-discord/organisation/issues/222 for additional information

[lemonsaurus]

Yeah, these are excellent. This encapsulates perfectly the discussion we had on this topic, and is well-written besides. Also, the other changes here unrelated to log levels are necessary, and well executed.

Nice work.

[kwzrd]

I find this very well written, informative and easy to digest.

One thing that I noticed going over the doc is that the type annotation examples are out of sync with prevailing style in our repositories. Here, we'd prefer that input_2 is annotated using typing.Dict with the key, value types also specified:

def foo(input_1: int, input_2: dict) -> bool:

The example just below lacks whitespace around the =, which is anti-PEP8 and will raise E252 using our lint configuration.

def foo(bar: int, baz: dict=None) -> bool:

Should we perhaps adjust these while we're at it?