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

[Chris Jerdonek]

Chris Jerdonek added the comment:

io module experts: Can one of you review this minor change to the subprocess documentation to make it reference the newly added io.TextIOWrapper documentation changes?

For background purposes, digging back, it looks like the original change to subprocess was made here: 9ce8fa0a0899

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nosy: +benjamin.peterson, hynek, pitrou, stutzbach
versions: +Python 3.2

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