[docs] [issue26897] Clarify Popen stdin, stdout, stderr

[Martin Panter]

Martin Panter added the comment:

Yes, in all cases I understand it is just the file descriptor that matters. Perhaps any documentation update could also take Issue 24358 into account, which points out that compressed and buffered file object wrappers also cause inconsistencies in the data at the high-level file object and the OS-level file descriptor.

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nosy: +martin.panter
stage:  -> needs patch
versions: +Python 2.7, Python 3.5

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<http://bugs.python.org/issue26897>
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