http: remove a pair of outdated comments

Fixes: #21202

PR-URL: #21214
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Weijia Wang <starkwang@126.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

lib/_http_common.js

@@ -109,8 +109,6 @@ function parserOnHeadersComplete(versionMajor, versionMinor, headers, method,
   return parser.onIncoming(incoming, shouldKeepAlive);
 }
 
-// XXX This is a mess.
-// TODO: http.Parser should be a Writable emits request/response events.
 function parserOnBody(b, start, len) {
   const stream = this.incoming;