[docs] [issue36661] Missing import in docs

[Merlin Fisher-Levine]

New submission from Merlin Fisher-Levine <merlin.fisherlevine at gmail.com>:

Dataclasses docs don't mention needing import for @dataclass decorator

https://docs.python.org/3/library/dataclasses.html

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assignee: docs at python
components: Documentation
messages: 340510
nosy: docs at python, mfisherlevine
priority: normal
severity: normal
status: open
title: Missing import in docs
type: enhancement
versions: Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36661>
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