[docs] [issue19477] document tp_print() as being dead in Py3

[Mark Lawrence]

Mark Lawrence added the comment:

@Stefan can you provide a patch for this?

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nosy: +BreamoreBoy
versions: +Python 3.5 -Python 3.1, Python 3.2, Python 3.3

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<http://bugs.python.org/issue19477>
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