(Fix): Update pylint (v. 2.17.7) tutorial link

[kellyky]

About

Updates URL for pytest tutorial - and also link text (since the tutorial is on the pylint documentation rather than pycqa).

(Just noting that when I ran Prettier, it also caught a couple unrelated whitespace changes.)

Recap in forum discussion thread, but the existing link 404'd

[github-actions]

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[SleeplessByte]

cc @exercism/python

[BethanyG]

Many thanks for catching and correcting this! 😄 🚀