Docs for `onCaughtError`, `onRecoverableError` and how to test error boundaries

[eps1lon]

Docs for https://github.com/testing-library/react-testing-library/pull/1354

https://deploy-preview-1417--testing-library.netlify.app/docs/react-testing-library/api#oncaughterror https://deploy-preview-1416--testing-library.netlify.app/docs/react-testing-library/faq/

Testing error boundaries is closely related to onCaughtError so it felt natural to include docs here.

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