[issue21573] Clean up turtle.py code formatting

[R. David Murray]

R. David Murray added the comment:

A side note about tests: once a couple or three years ago I made it so that you could run 'make doctest' against the turtle documentation and it would work (displaying stuff on the screen).  There's no checking of the output, but it proved the examples at least executed cleanly (with the help of some sphinx-hidden extra code).

For whatever it is worth, they still appear to run to completion:

Document: library/turtle
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1 items passed all tests:
 313 tests in default
313 tests in 1 items.
313 passed and 0 failed.
Test passed.

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nosy: +r.david.murray

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