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

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Current docs use "bytes or bytearray object" (without references). "bytes" is just an alias to "str" in 2.7, but I prefer to use this name, for consistency with 3.x and for accenting the binary nature of the data.

Your new wording LGTM.

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<http://bugs.python.org/issue20699>
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