[3.15] gh-157847: Re-write more of the turtle reference docs (GH-159685) (#159948)

gh-157847: Re-write more of the `turtle` reference docs (GH-159685)
(cherry picked from commit f071bac)

Co-authored-by: Stan Ulbrych <stan@python.org>
Co-authored-by: Maciej Olko <maciej.olko@affirm.com>
Co-authored-by: Carol Willing <carolcode@willingconsulting.com>

Author: 4 people