gh-157847: Improve more turtle docstrings and docs

[StanFromIreland]

This continues the work started in #158281 and #158330. It improves the reference docs and docstrings, modernising them, making them easier to understand/clearer, and consistent.

Yes, a few could reasonably be classified as churn, however, the turtle module is, frankly, quite messy in places. I think these changes improve readability and, as a result, maintainability, so I intend to tidy up similar issues. They should also have relatively little impact on useful Git history, since the majority of the affected lines date back to the original port in 97cf99f.

• Issue: Restructure the turtle documentation #157847

[read-the-docs-community]

Documentation build overview

📚 cpython-previews | 🛠️ Build #34876528 | 📁 Comparing 98f665c against main (0906d2a)

  🔍 Preview build  

1 file changed

± library/turtle.html