Then I fail to see what you want. You can already do all you need.
Do you want 3.7.1 to be the default python/python3 or something?
Documentation-wise, you can submit improvements using the “Improve this page on Github” links on top of doc pages.
That said, I would wholeheartedly support the latter. Available Python versions and how to use them (export PATH="/opt/python/3.7.1/bin:$PATH"? Would never guess that. Do I need to do the same for all the other versions, or just some of them?) are completely undocumented, see https://travis-ci.community/t/document-supported-pypy-versions .