doc: fix url example to match behavior

Fixes one WHATWG URL example to match the actual behavior.

PR-URL: nodejs#23359
Fixes: nodejs#22653
Reviewed-By: Rich Trott <[email protected]>
Reviewed-By: Sakthipriyan Vairamani <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Vse Mozhet Byt <[email protected]>
Reviewed-By: Tiancheng "Timothy" Gu <[email protected]>
Reviewed-By: James M Snell <[email protected]>

doc/api/url.md

@@ -1286,7 +1286,7 @@ const myURL = new URL('https://%CF%80.example.com/foo');
 console.log(myURL.href);
 // Prints https://xn--1xa.example.com/foo
 console.log(myURL.origin);
-// Prints https://π.example.com
+// Prints https://xn--1xa.example.com
 ```
 
 [`Error`]: errors.html#errors_class_error