[docs] [issue37730] NotImplemented is used instead of NotImplementedError in docs

[David Heiberg]

Change by David Heiberg <dhdavvie at gmail.com>:


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pull_requests: +14872
pull_request: https://github.com/python/cpython/pull/15133

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37730>
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