debugger beta: Update debugger docs for beta (#31192)

The docs include basic information on starting a session but will need
to be further iterated upon once we get deeper into the beta

Release Notes:

- N/A

docs/src/SUMMARY.md

@@ -32,6 +32,7 @@
 - [Channels](./channels.md)
 - [Collaboration](./collaboration.md)
 - [Git](./git.md)
+- [Debugging (Beta)](./debuggers.md)
 - [Tasks](./tasks.md)
 - [Remote Development](./remote-development.md)
 - [Environment Variables](./environment.md)