http: fix close return value mismatch between doc and implementation

PR-URL: #51797
Fixes: #51787
Reviewed-By: Paolo Insogna <paolo@cowtech.it>
Reviewed-By: Robert Nagy <ronagy@icloud.com>
Reviewed-By: Ethan Arrowood <ethan@arrowood.dev>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com>

lib/_http_server.js

@@ -561,6 +561,7 @@ ObjectSetPrototypeOf(Server, net.Server);
 Server.prototype.close = function() {
   httpServerPreClose(this);
   ReflectApply(net.Server.prototype.close, this, arguments);
+  return this;
 };
 
 Server.prototype[SymbolAsyncDispose] = async function() {

lib/https.js

@@ -111,6 +111,7 @@ Server.prototype.setTimeout = HttpServer.prototype.setTimeout;
 Server.prototype.close = function() {
   httpServerPreClose(this);
   ReflectApply(tls.Server.prototype.close, this, arguments);
+  return this;
 };
 
 Server.prototype[SymbolAsyncDispose] = async function() {

test/parallel/test-http-server.js

@@ -139,4 +139,5 @@ process.on('exit', function() {
   assert.match(server_response, quit);
 
   assert.strictEqual(client_got_eof, true);
+  assert.strictEqual(server.close(), server);
 });