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

[Brett Cannon]

Brett Cannon <brett at python.org> added the comment:

I also don't think it's critical to make examples within a module's docs work like a doctest. Plus I discourage importing objects directly off of modules anyway and this would actually promote that.

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nosy: +brett.cannon

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