Python: tox is lowercase

[hugovk]

Why:

For consistency, spell tox all in lowercase. This is how the tox project spells it, and these docs also have it lowercase in some places.

https://tox.readthedocs.io/

https://twitter.com/jugmac00/status/1431712286557843457

What's being changed:

Change example workflow to use lowercase tox.

Check off the following:

• I have reviewed my changes in staging (look for the latest deployment event in your pull request's timeline, then click View deployment).
• For content changes, I have completed the self-review checklist.

Writer impact (This section is for GitHub staff members only):

• This pull request impacts the contribution experience
  • I have added the 'writer impact' label
  • I have added a description and/or a video demo of the changes below (e.g. a "before and after video")

[welcome]

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[jugmac00]

As a maintainer of tox, I'd say...

[ramyaparimi]

@hugovk
Thanks so much for opening a PR! I'll get this triaged for review ⚡

[felicitymay]

@hugovk - thanks for alerting us to this typo and for opening a pull request to fix it 💖

I particularly appreciated the fact that you included links to show how this name is usually capitalized 🙇🏻‍♀️

@jugmac00 - thanks for commenting with your approval too 🚀

[github-actions]

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