Adjust heading levels in docs (#7163)

This PR adjusts the heading levels in the docs, as some of them weren't
following the right hierarchy.

I also formatted all of the docs with Prettier.

Release Notes:

- N/A

docs/src/feedback.md

@@ -1,29 +1,29 @@
 # Giving feedback
 
-### Zed repository
+## Zed repository
 
 We track our issues at [`zed-industries/zed`](https://github.com/zed-industries/zed/issues).
 
-#### Feature requests
+### Feature requests
 
 Try to focus on the things that are most critical to you rather than exhaustively listing all features another editor you have used has.
 
 Command palette: `request feature`
 
-#### Bug reports
+### Bug reports
 
 Try to add as much detail as possible, if it is not obvious to reproduce. Let us know how severe the problem is for you; is the issue more of a minor inconvenience or something that would prevent you from using Zed?
 
 Command palette: `file bug report`
 
-### In-app feedback
+## In-app feedback
 
 Anonymous feedback can be submitted from within Zed via the feedback editor (command palette: `give feedback`).
 
-### Zed forum
+## Zed forum
 
 Use the [Zed forum](https://github.com/zed-industries/zed/discussions) to ask questions and learn from one another. We will be present in the forum and answering questions as well.
 
-### Email
+## Email
 
 If you prefer to write up your thoughts as an email, you can send them to [hi@zed.dev](mailto:hi@zed.dev).