doc: add URL.format() example

PR-URL: #18888
Fixes: #18887
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Rich Trott <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>
Reviewed-By: Vse Mozhet Byt <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Roman Reiss <[email protected]>
Reviewed-By: Daijiro Wachi <[email protected]>
Reviewed-By: Tobias Nießen <[email protected]>

Author: zeke

doc/api/url.md

@@ -971,6 +971,20 @@ changes:
 The `url.format()` method returns a formatted URL string derived from
 `urlObject`.
 
+```js
+url.format({
+  protocol: 'https',
+  hostname: 'example.com',
+  pathname: '/some/path',
+  query: {
+    page: 1,
+    format: 'json'
+  }
+});
+
+// => 'https://example.com/some/path?page=1&format=json'
+```
+
 If `urlObject` is not an object or a string, `url.format()` will throw a
 [`TypeError`][].