[docs] [issue17045] Improve C-API doc for PyTypeObject

[Ezio Melotti]

Changes by Ezio Melotti <ezio.melotti at gmail.com>:


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assignee:  -> docs at python
components: +Documentation
nosy: +docs at python, ezio.melotti
stage:  -> patch review
type:  -> enhancement
versions: +Python 3.3, Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17045>
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