link to user-event docs

Author: EskiMojo14

docs/usage/WritingTests.mdx

@@ -65,6 +65,7 @@ We also **recommend using [Mock Service Worker (MSW)](https://mswjs.io/) to mock
   - [DOM Testing Library: Setup](https://testing-library.com/docs/dom-testing-library/setup)
   - [React Testing Library: Setup](https://testing-library.com/docs/react-testing-library/setup)
   - [Testing Library Jest-DOM Matchers](https://testing-library.com/docs/ecosystem-jest-dom)
+  - [Testing Library User Events](https://testing-library.com/docs/user-event)
 - **Mock Service Worker**
   - [MSW: Installation](https://mswjs.io/docs/getting-started/install)
   - [MSW: Setting up mock requests](https://mswjs.io/docs/getting-started/mocks/rest-api)