fix missing import in dataclass code snippet

[LeoHuckvale]

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[the-knights-who-say-ni]

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[sobolevn]

The import is indeed missing, thanks! But you need to sign CLA to be able to contibute 🙂

[LeoHuckvale]

@sobolevn done - may take a day to come through though.

[CoolCat467]

@LeoHuckvale I have noticed that the CLA check does not actually occur automatically every day like it claims to, but there we go.

[CoolCat467]

@sobolevn CLA signed