[issue28091] Document PEP 525

[Eric Appelt]

Eric Appelt added the comment:

Thanks for the explanations and example code in the review! Working on this issue is really helping to improve my understanding of a number of tricky things like finalization.

I *think* that I have all the comments implemented in the attached patch.

I also removed a spurious 2-line fragment at the top of the Asynchronous generator-iterator methods section that I had neglected to delete and escaped review.

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Added file: http://bugs.python.org/file45903/pep525_pep530_docs_v2.patch

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