docs: Update incorrect docstring in config.py

Review Request #1593 - Created Jan. 11, 2015 and submitted

Information
Mateo Rodriguez
pants
e25c89a...
Reviewers
pants-reviews
jsirois, lahosken

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.

This just touches comments.

Eric Ayers
John Sirois
John Sirois
Mateo Rodriguez
Review request changed

Status: Closed (submitted)

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