[issue36203] PyWeakref_NewRef docs are misleading

[Windson Yang]

Windson Yang <wiwindson at outlook.com> added the comment:

It looks to me the fix is easy, we just will return NULL and raise TypeError when the callback is not callable, None, or NULL. I'm not an expert in C, but I would love to create a PR for it if you don't have time.

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<https://bugs.python.org/issue36203>
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