[docs] [issue29165] Use forward compatible macro in example code for creating new type

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

PyVarObject_HEAD_INIT() is more used in Python 3 code, but the code with PyObject_HEAD_INIT() doesn't look incompatible with Python 3. I don't see a need of this change.

PyObject_HEAD_INIT() also is used in .c files in Doc/includes/.

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nosy: +serhiy.storchaka

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<http://bugs.python.org/issue29165>
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