doc: fix some broken links

Signed-off-by: Antoine du Hamel <duhamelantoine1995@gmail.com>
PR-URL: #65583
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: René <contact.9a5d6388@renegade334.me.uk>
Reviewed-By: Filip Skokan <panva.ip@gmail.com>

Author: aduh95

doc/api/fs.md

@@ -8440,7 +8440,6 @@ of bytes written is passed as the first argument to the event handler.
     * `writeBufferLen` {number}
     * `remainingBufferLen`: {number}
   * `sync`: {boolean} Perform writes synchronously.
-* Returns: {fs.Utf8Stream}
 
 #### `utf8Stream.append`
 

doc/type-map.json

@@ -88,6 +88,7 @@
   "LockManager": "worker_threads.html#class-lockmanager",
   "MessagePort": "worker_threads.html#class-messageport",
   "MIMEParams": "util.html#class-utilmimeparams",
+  "MIMEType": "util.html#class-utilmimetype",
   "MockModuleContext": "test.html#class-mockmodulecontext",
   "module": "modules.html#the-module-object",
   "ModuleRequest": "vm.html#type-modulerequest",