add @types/react-dom to the types install

Co-authored-by: Sebastian Silbermann <silbermann.sebastian@gmail.com>

Author: MatanBobi

docs/react-testing-library/intro.mdx

@@ -22,7 +22,7 @@ To get full type coverage, you need to install the types for `react-dom` as
 well:
 
 ```bash npm2yarn
-npm install --save-dev @testing-library/react @types/react-dom
+npm install --save-dev @testing-library/react @testing-library/dom @types/react-dom
 ```
 
 [gh]: https://github.com/testing-library/react-testing-library