[docs] [issue17811] Improve os.readv() and os.writev() documentation and docstring

[Nikolaus Rath]

Nikolaus Rath added the comment:

What section do you mean? bytearray is not mentioned anywhere in
http://docs.python.org/3.4/library/os.html.

I think the problem with just linking to the C API section is that it doesn't help people that are only using pure Python. You can't look at a Python object and tell whether it implements the buffer protocol or not. Therefore, I think it would be important to give at least a reference to memoryview as the Python equivalent of the buffer protocol.

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