Address reviewer's comment

Author: deokjinkim

doc/api/url.md

@@ -251,15 +251,15 @@ const myURL = new URL('https://example.org:81/foo');
 console.log(myURL.hostname);
 // Prints example.org
 
-// Setting an invalid hostname is ignored:
-myURL.hostname = 'example.com:82';
+// Setting the hostname does not change the port
+myURL.hostname = 'example.com';
 console.log(myURL.href);
-// Prints https://example.org:81/foo
+// Prints https://example.com:81/foo
 
 // Use myURL.host to change the hostname and port
-myURL.host = 'example.com:82';
+myURL.host = 'example.org:82';
 console.log(myURL.href);
-// Prints https://example.com:82/foo
+// Prints https://example.org:82/foo
 ```
 
 Invalid host name values assigned to the `hostname` property are ignored.