[docs] [issue17380] initproc return value is unclear

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc added the comment:

Note that all these cases are compatible with "tp_init returns 0 on success and -1 on error".

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17380>
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