[PR #7916/822fbc74 backport][3.9] Add more information to contributing page #8072
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This is a backport of PR #7916 as merged into master (822fbc7).
Mostly revamp coverage section with an example demonstrating how to analyse covecov reports.
I think #7829 works as a perfect example of how codecov is really useful to us.
Preview: https://aiohttp--7916.org.readthedocs.build/en/7916/contributing.html#tests-coverage