[docs] [issue16575] ctypes: unions as arguments

[Roundup Robot]

Roundup Robot added the comment:

New changeset eece32440a52 by Eli Bendersky in branch '2.7':
Add warning in ctypes documentation for #16575 and #16576
http://hg.python.org/cpython/rev/eece32440a52

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16575>
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