[issue10291] Clean-up turtledemo in-package documentation

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

The patch contains one unrelated code change.

I think the docstrings should not go as is but be cleaned up to match docstrings conventions.  I’ve also spotted some phrasing issues.

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<http://bugs.python.org/issue10291>
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