[docs] [issue32216] Document PEP 557 Data Classes (dataclasses module)

[Barry A. Warsaw]

Barry A. Warsaw <barry at python.org> added the comment:

I've got a branch that cleans up and updates the dataclasses documentation, so I'm reopening this issue and piggybacking my PR on it.

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status: closed -> open

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<https://bugs.python.org/issue32216>
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