[docs] [issue20699] Document that binary IO classes work with bytes-likes objects

[Martin Panter]

Martin Panter added the comment:

Thanks for you help figuring this out Serhiy, especially for the Python 2 case.

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resolution:  -> fixed
stage: commit review -> resolved
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20699>
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