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

[Roundup Robot]

Roundup Robot added the comment:

New changeset bead459ccce8 by Georg Brandl in branch '3.4':
Closes #19477: remove outdated documentation of tp_print type object slot.
https://hg.python.org/cpython/rev/bead459ccce8

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nosy: +python-dev
resolution:  -> fixed
stage: needs patch -> resolved
status: open -> closed

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