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

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Ah, now I see.

I think sample C files in Doc/includes/ should be updated too. And it seems to me that Doc/includes/shoddy.c in Python 3 is not correct.

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