[docs] [issue15656] "Extending Python with C" page needs update for 3.x

[Roundup Robot]

Roundup Robot added the comment:

New changeset 599376deeeac by Eli Bendersky in branch '3.2':
Issue #15656: fixing code sample in extending doc
http://hg.python.org/cpython/rev/599376deeeac

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nosy: +python-dev

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15656>
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