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

[INADA Naoki]

INADA Naoki added the comment:


New changeset 9436bbd87b7eed18dec4c32f25b88452fe282e1c by GitHub in branch '2.7':
bpo-29165: doc: make extending/newtypes more Python 3 friendly (GH-211)
https://github.com/python/cpython/commit/9436bbd87b7eed18dec4c32f25b88452fe282e1c


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