[docs] [issue22695] open() declared deprecated in python 3 docs

[R. David Murray]

R. David Murray added the comment:

Presumably we can fix it.  The code is in Docs/tools/pyspecific.py.  Probably just need to figure out how it is different from the regular Sphinx deprecated tag implementation.

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nosy: +r.david.murray

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<http://bugs.python.org/issue22695>
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