[docs] [issue32216] Document PEP 557 Data Classes

[Eric V. Smith]

New submission from Eric V. Smith <eric at trueblade.com>:

The documentation needs to be added.

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assignee: docs at python
components: Documentation
messages: 307614
nosy: docs at python, eric.smith
priority: high
severity: normal
status: open
title: Document PEP 557 Data Classes
versions: Python 3.7

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