use brevity to improve readability

[kedarmhaswade]

The guide has become rather difficult to read at places. This is an attempt to improve its readability. I believe you meant use and not usage (these words mean different things) and I have gone ahead with the suggestion to use the word use here. If you indeed meant usage, then I am afraid, that sentence should be reworded.

Also, the sentence This guide is opinionated in a way that is almost, but not quite, entirely unlike Python’s official documentation. is also unnecessarily complicated (the placement of comma makes it even harder to understand). But I will leave it out of this commit.