docs: add comment about 'cleanup' in react-testing-library example #9144
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Summary
react-testing-libraryautomatically runscleanupunless otherwise specified (testing-library/react-testing-library#430). The change takes place in@testing-library/[email protected](https://github.com/testing-library/react-testing-library/releases/tag/v9.0.0) and later.I found the documentation to be contradictory as to whether
afterEach(cleanup)should be called, and so hopefully this comment clarifies it for future users.Test plan
This is just adding a comment, so I do not believe any test plan is necessary.