Document Signed HTTP exchanges

[Josh-Cena]

MDN URL

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

What specific section or headline is this issue about?

No response

What information was incorrect, unhelpful, or incomplete?

Follow up from: #1458

Need pages for the following:

• Accept-Signature
• Signed-Headers
• Signature

What did you expect to see?

New pages

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

Also see Brian's resources:

For signed exchanges, some info here:

• https://github.com/WICG/webpackage?tab=readme-ov-file#specifications
• Blogs:
  • https://web.dev/articles/signed-exchanges
  • https://developers.google.com/search/docs/appearance/signed-exchange
  • https://developers.cloudflare.com/speed/optimization/other/signed-exchanges/

Do you have anything more you want to share?

No response