This PR removes two comments from the default settings, as these merely
describe the sorting of the keys to follow and do not provide much
context/help for users browsing our default settings.

## Self-review

- [X] I've reviewed my diff for quality, security, reliability, and
performance.
- [-] UI changes follow the
[checklist](https://zed.dev/docs/development/ui-checklist).
- [-] Tests cover the new or changed behavior.

Release Notes:

- N/A