Revert "docs: remove note on peer deps to reduce confusion"

This reverts commit 741cabd.

Author: nickserv

docs/user-event/install.mdx

@@ -25,3 +25,12 @@ yarn add --dev @testing-library/user-event
 
 </TabItem>
 </Tabs>
+
+Note that `@testing-library/user-event` requires `@testing-library/dom`.
+
+If you use one of the
+[framework wrappers](../dom-testing-library/install.mdx#wrappers), it is
+important that `@testing-library/dom` is resolved to the same installation
+required by the framework wrapper of your choice.  
+Usually this means that if you use one of the framework wrappers, you should not
+add `@testing-library/dom` to your project dependencies.