http: add RFC references for each status code

Reference format: `RFC <rfc id> <section path>`

PR-URL: https://github.com/nodejs/node/pull/33671


Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Pranshu Srivastava <rexagod@gmail.com>
Reviewed-By: Ricky Zhou <0x19951125@gmail.com>