[docs] [issue37342] A type error in typeobj.rst

[hai shi]

New submission from hai shi <shihai1991 at 126.com>:

nb_index's type is unaryfunc

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assignee: docs at python
components: Documentation
messages: 346071
nosy: docs at python, shihai1991
priority: normal
severity: normal
status: open
title: A type error in typeobj.rst

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37342>
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