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

[Roundup Robot]

Roundup Robot added the comment:

New changeset 381aaf79c254 by Andrew Svetlov in branch '3.2':
Issue #15561: Update subprocess docs to reference io.TextIOWrapper.
http://hg.python.org/cpython/rev/381aaf79c254

New changeset 0cd9423770fa by Andrew Svetlov in branch 'default':
Issue #15561: Update subprocess docs to reference io.TextIOWrapper.
http://hg.python.org/cpython/rev/0cd9423770fa

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nosy: +python-dev

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