HTTP Headers overview links to non-documented Signature headers

### MDN URL

https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers

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

https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers#other_2

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

The page invokes the `domxref` macro to link to `Accept-Signature`, `Signature`, and `Signed-Headers`, but these pages don't exist.

### What did you expect to see?

I would expect the page to not list these headers at all, or at least not link to them.

### 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/http/reference/headers`
* MDN URL: https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers
* GitHub URL: https://github.com/mdn/content/blob/main/files/en-us/web/http/reference/headers/index.md
* Last commit: https://github.com/mdn/content/commit/013f3148c4e85038bd961c984e357da703d315e3
* Document last modified: 2025-12-21T22:29:58.000Z