[issue12297] Clarifications to atexit.register and unregister doc

[Éric Araujo]

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

I wrote the patch after testing in a shell, so I’m confident it describes reality; I was more asking a wording/phrasing review.

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<http://bugs.python.org/issue12297>
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