In the code sample documentation for other modules we show the necessary imports, we should do the same for dataclasses.

For example, the very first example uses the `dataclass` decorator without importing it first. It should read::

    from dataclasses import dataclass

    @dataclass
    class InventoryItem:
        ...

This is a duplicate of issue 36661.

superseder: Missing dataclass decorator import in dataclasses module docs

nosy: + eric.smith
messages: + msg355292
resolution: duplicate
stage: resolved