[docs] [issue15561] update subprocess docs to reference io.TextIOWrapper

[Chris Jerdonek]

Chris Jerdonek added the comment:

For 3.2 to mention write_through, issue 15638 should probably be fixed first.  I can create a patch for that first.

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dependencies: +incorrect version info for TextIOWrapper write_through docs

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<http://bugs.python.org/issue15561>
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