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

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

Create a PR for master. When it be merged it can be backported automatically to other branches. Sometimes it may require manually backporting, but changes should be merged to master first.

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<https://bugs.python.org/issue37730>
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