doc: clarify ServerResponse explanations

In short: `ServerResponse` acutally inherits from `OutgoingMessage`,
with a series of methods like those in `Stream.Writable`. So we cannot
use `implements`(this has made poeple feel puzzled because there are
still many methods we don't need or have), so `inherits from Stream` is
enough, due to some core reasons and performance told by mcollina from
the ref (See some latest discussions at Ref).

Ref: #14146.
PR-URL: #22305
Reviewed-By: Matteo Collina <[email protected]>
Reviewed-By: Trivikram Kamat <[email protected]>
Reviewed-By: Vse Mozhet Byt <[email protected]>
Reviewed-By: Jon Moss <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>

doc/api/http.md

@@ -313,8 +313,8 @@ the data is read it will consume memory that can eventually lead to a
 Node.js does not check whether Content-Length and the length of the
 body which has been transmitted are equal or not.
 
-The request implements the [Writable Stream][] interface. This is an
-[`EventEmitter`][] with the following events:
+The request inherits from [Stream][], and additionally implements the
+following:
 
 ### Event: 'abort'
 <!-- YAML
@@ -1007,8 +1007,8 @@ added: v0.1.17
 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 implements, but does not inherit from, the [Writable Stream][]
-interface. This is an [`EventEmitter`][] with the following events:
+The response inherits from [Stream][], and additionally implements the
+following:
 
 ### Event: 'close'
 <!-- YAML
@@ -2062,7 +2062,6 @@ not abort the request or do anything besides add a `'timeout'` event.
 [`'upgrade'`]: #http_event_upgrade
 [`Agent`]: #http_class_http_agent
 [`Duplex`]: stream.html#stream_class_stream_duplex
-[`EventEmitter`]: events.html#events_class_eventemitter
 [`TypeError`]: errors.html#errors_class_typeerror
 [`URL`]: url.html#url_the_whatwg_url_api
 [`agent.createConnection()`]: #http_agent_createconnection_options_callback
@@ -2105,4 +2104,3 @@ not abort the request or do anything besides add a `'timeout'` event.
 [`socket.unref()`]: net.html#net_socket_unref
 [`url.parse()`]: url.html#url_url_parse_urlstring_parsequerystring_slashesdenotehost
 [Readable Stream]: stream.html#stream_class_stream_readable
-[Writable Stream]: stream.html#stream_class_stream_writable

doc/api/http2.md

@@ -2711,8 +2711,8 @@ added: v8.4.0
 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 implements, but does not inherit from, the [Writable Stream][]
-interface. This is an [`EventEmitter`][] with the following events:
+The response inherits from [Stream][], and additionally implements the
+following:
 
 #### Event: 'close'
 <!-- YAML
@@ -3231,13 +3231,11 @@ following additional properties:
 [Readable Stream]: stream.html#stream_class_stream_readable
 [RFC 7838]: https://tools.ietf.org/html/rfc7838
 [Using `options.selectPadding()`]: #http2_using_options_selectpadding
-[Writable Stream]: stream.html#stream_writable_streams
 [`'checkContinue'`]: #http2_event_checkcontinue
 [`'request'`]: #http2_event_request
 [`'unknownProtocol'`]: #http2_event_unknownprotocol
 [`ClientHttp2Stream`]: #http2_class_clienthttp2stream
 [`Duplex`]: stream.html#stream_class_stream_duplex
-[`EventEmitter`]: events.html#events_class_eventemitter
 [`Http2ServerRequest`]: #http2_class_http2_http2serverrequest
 [`Http2Session` and Sockets]: #http2_http2session_and_sockets
 [`Http2Stream`]: #http2_class_http2stream