[docs] [issue23756] Tighten definition of bytes-like objects

[Stefan Krah]

Stefan Krah added the comment:

For end users it's probably adequate. But several committers find
the term confusing (msg236283, msg188484). :)

Anyway, I'm going to commit this since it adds clarity.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23756>
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