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

[INADA Naoki]

INADA Naoki added the comment:

> And it seems to me that Doc/includes/shoddy.c in Python 3 is not correct.

I created another pull request PR 215.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29165>
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