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

[Eric V. Smith]

Change by Eric V. Smith <eric at trueblade.com>:


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title: Document PEP 557 Data Classes -> Document PEP 557 Data Classes (dataclasses module)

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32216>
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