docs(qwik): add support for happy-dom (#1513)

Author: ianlet

docs/qwik-testing-library/setup.mdx

@@ -23,12 +23,16 @@ interactions with the DOM.
 npm install --save-dev @testing-library/jest-dom @testing-library/user-event
 ```
 
-Finally, we need a DOM environment to run the tests in. This library was tested
-(for now) only with `jsdom` so we recommend using it:
+Finally, we need a DOM environment to run the tests in. This library is tested
+with both `jsdom` and `happy-dom`:
 
 ```bash npm2yarn
 npm install --save-dev jsdom
 ```
+or
+```bash npm2yarn
+npm install --save-dev happy-dom
+```
 
 [npm]: https://www.npmjs.com/
 [node]: https://nodejs.org
@@ -71,7 +75,7 @@ export default defineConfig(configEnv =>
       },
       // configure your test environment
       test: {
-        environment: 'jsdom',
+        environment: 'jsdom', // or 'happy-dom'
         setupFiles: ['./vitest.setup.ts'],
         globals: true,
       },