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

[Martin Panter]

Martin Panter added the comment:

I updated my patch thanks to Serhiy’s comments. Also omitted Arg Clinic generated code in this version to avoid future merge conflicts with the hashes.

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versions: +Python 3.6 -Python 3.4
Added file: http://bugs.python.org/file42934/bytes-like-param.v6.patch

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