[issue12297] Clarifications to atexit.register and unregister doc

[Éric Araujo]

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

Thanks.  I’ve also realized that the doc does not mention that any callable can be used; I don’t know if we should say it explicitly (I think I did a change like that recently in another file), or if we expect people to just know it from experience, or if we should add an entry for “function” in the glossary.

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