doc,url: fix url.hostname example

PR-URL: #33735
Reviewed-By: Gireesh Punathil <[email protected]>
Reviewed-By: Antoine du Hamel <[email protected]>

Author: darkrishabh

doc/api/url.md

@@ -210,9 +210,15 @@ const myURL = new URL('https://example.org:81/foo');
 console.log(myURL.hostname);
 // Prints example.org
 
+// Setting the hostname does not change the port
 myURL.hostname = 'example.com:82';
 console.log(myURL.href);
 // Prints https://example.com:81/foo
+
+// Use, myURL.host to change the hostname and port
+myURL.host = 'example.org:82';
+console.log(myURL.href);
+// Prints https://example.org:82/foo
 ```
 
 Invalid host name values assigned to the `hostname` property are ignored.