[docs] [issue4934] tp_del and tp_version_tag undocumented

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

The reason tp_del has remained undocumented is that it's now obsolete.  You should use tp_finalize instead:
https://docs.python.org/3/c-api/typeobj.html#c.PyTypeObject.tp_finalize

tp_finalize is roughly the C equivalent of __del__ (tp_del was something else, despite the name).

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versions: +Python 3.7, Python 3.8

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