[docs] [issue15638] incorrect version info for TextIOWrapper write_through docs

[R. David Murray]

R. David Murray added the comment:

If I remember correctly it existed in one of the versions (python vs C) but not in both.  Or, it existed but wasn't actually respected by one of the versions.

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nosy: +pitrou, r.david.murray

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<http://bugs.python.org/issue15638>
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