Summary

In the main description, replace “Python 3” with just “Python.”

At this point, Python 2 has been end-of-life for over six years, and a reader should start with the assumption that it isn’t supported; the explicit “Python 3” now just adds noise.

Checklist

• I understand that this PR may be closed in case there was no previous discussion. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change. No tests required; not a code change
• I've updated the documentation accordingly. This is a documentation change.