http: fix close return value mismatch between doc and implementation

Author: kylo5aby

lib/_http_server.js

@@ -570,6 +570,7 @@ 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() {