[3.7] Dataclasses: Fix example on 30.6.8, add method should receive a list rather than an integer. (GH-8038) by miss-islington · Pull Request #8237 · python/cpython

…rather than an integer. (pythonGH-8038)

Change example function to append rather than add lists.
(cherry picked from commit da5e947)

Co-authored-by: Tom Faulkner <tomfaulkner@gmail.com>

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