doc: include ESM import for HTTP

PR-URL: nodejs#53165
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Paolo Insogna <paolo@cowtech.it>
Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com>
Reviewed-By: Vinícius Lourenço Claro Cardoso <contact@viniciusl.com.br>

doc/api/http.md

@@ -6,7 +6,8 @@
 
 <!-- source_link=lib/http.js -->
 
-To use the HTTP server and client one must `require('node:http')`.
+This module, containing both a client and server, can be imported via
+`require('node:http')` (CommonJS) or `import * as http from 'node:http'` (ES module).
 
 The HTTP interfaces in Node.js are designed to support many features
 of the protocol which have been traditionally difficult to use.