docs: Update incorrect docstring in config.py
docs: Update incorrect docstring in config.py

The getbool docstring says to expect a string. The default type is string
but this function returns a bool, as you might expect.

Added periods to a few other docstrings while I was there.

Testing Done:
This just touches comments.

Reviewed at https://rbcommons.com/s/twitter/r/1593/

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