doc: add http.IncomingMessage#connection

Refs: https://github.com/nodejs/node/issues/33715

* link message.socket
* deprecate
* update doc/api/http.md

PR-URL: https://github.com/nodejs/node/pull/33768
Reviewed-By: Robert Nagy <ronagy@icloud.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>

doc/api/deprecations.md

@@ -2699,6 +2699,19 @@ resolutions not in `node_modules`. This means there will not be deprecation
 warnings for `"exports"` in dependencies. With `--pending-deprecation`, a
 runtime warning results no matter where the `"exports"` usage occurs.
 
+<a id="DEP0148"></a>
+### DEP0148: `http.IncomingMessage#connection`
+<!-- YAML
+changes:
+  - version: REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/33768
+    description: Documentation-only deprecation.
+ -->
+
+Type: Documentation-only.
+
+Prefer [`message.socket`][] over [`message.connection`][].
+
 [Legacy URL API]: url.md#url_legacy_url_api
 [NIST SP 800-38D]: https://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-38d.pdf
 [RFC 6066]: https://tools.ietf.org/html/rfc6066#section-3
@@ -2757,6 +2770,8 @@ runtime warning results no matter where the `"exports"` usage occurs.
 [`http.request()`]: http.md#http_http_request_options_callback
 [`https.get()`]: https.md#https_https_get_options_callback
 [`https.request()`]: https.md#https_https_request_options_callback
+[`message.connection`]: http.md#http_message_connection
+[`message.socket`]: http.md#http_message_socket
 [`module.createRequire()`]: module.md#module_module_createrequire_filename
 [`os.networkInterfaces()`]: os.md#os_os_networkinterfaces
 [`os.tmpdir()`]: os.md#os_os_tmpdir

doc/api/http.md

@@ -1984,6 +1984,16 @@ const req = http.request({
 });
 ```
 
+### `message.connection`
+<!-- YAML
+added: v0.1.90
+deprecated: REPLACEME
+ -->
+
+> Stability: 0 - Deprecated. Use [`message.socket`][].
+
+Alias for [`message.socket`][].
+
 ### `message.destroy([error])`
 <!-- YAML
 added: v0.3.0
@@ -2742,6 +2752,7 @@ try {
 [`net.Socket`]: net.md#net_class_net_socket
 [`net.createConnection()`]: net.md#net_net_createconnection_options_connectlistener
 [`new URL()`]: url.md#url_new_url_input_base
+[`message.socket`]: #http_message_socket
 [`removeHeader(name)`]: #http_request_removeheader_name
 [`request.end()`]: #http_request_end_data_encoding_callback
 [`request.destroy()`]: #http_request_destroy_error