doc: indicate that Http2ServerResponse extends Stream

Also removes the redundant statement explained by "extends Stream".

PR-URL: #29254
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>

Author: trivikr

doc/api/http2.md

@@ -2938,12 +2938,11 @@ Url {
 added: v8.4.0
 -->
 
+* Extends: {Stream}
+
 This object is created internally by an HTTP server — not by the user. It is
 passed as the second parameter to the [`'request'`][] event.
 
-The response inherits from [Stream][], and additionally implements the
-following:
-
 #### Event: 'close'
 <!-- YAML
 added: v8.4.0
@@ -3470,7 +3469,6 @@ following additional properties:
 [RFC 8336]: https://tools.ietf.org/html/rfc8336
 [RFC 8441]: https://tools.ietf.org/html/rfc8441
 [Readable Stream]: stream.html#stream_class_stream_readable
-[Stream]: stream.html#stream_stream
 [`'checkContinue'`]: #http2_event_checkcontinue
 [`'connect'`]: #http2_event_connect
 [`'request'`]: #http2_event_request