Modernize the `turtle` module

[StanFromIreland]

Linked PRs

• gh-158322: Tidy docstrings in turtle module #158281
• [3.15] gh-158322: Tidy up some docstrings in turtle module (GH-158281) #158324
• [3.14] gh-158322: Tidy up some docstrings in turtle module (GH-158281) #158325
• [3.13] gh-158322: Tidy up some docstrings in turtle module (GH-158281) #158326