Key values for keyboard events: outdated compatibility notes

### MDN URL

https://developer.mozilla.org/en-US/docs/Web/API/UI_Events/Keyboard_event_key_values

### What specific section or headline is this issue about?

notes about browser versions

### What information was incorrect, unhelpful, or incomplete?

Comments are no longer relevant as "this was not supported until FF37" seems not necessary. Should we update this page to removed unneeded notes.

### What did you expect to see?

Only relevant notes

### Do you have any supporting links, references, or citations?

_No response_

### Do you have anything more you want to share?

_No response_

### MDN metadata

Page report details

* Folder: `en-us/web/api/ui_events/keyboard_event_key_values`
* MDN URL: https://developer.mozilla.org/en-US/docs/Web/API/UI_Events/Keyboard_event_key_values
* GitHub URL: https://github.com/mdn/content/blob/main/files/en-us/web/api/ui_events/keyboard_event_key_values/index.md
* Last commit: https://github.com/mdn/content/commit/59273beac2be54841e7c6af2f282edca2204dfdc
* Document last modified: 2022-09-19T18:28:14.000Z