[docs] [issue36661] Missing dataclass decorator import in dataclasses module docs

[Cheuk Ting Ho]

Cheuk Ting Ho <cheukting.ho at gmail.com> added the comment:

I agree that for the more confusing ones, it would be better to write out the import statement explicitly.

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nosy: +Cheukting

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<https://bugs.python.org/issue36661>
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