doc: fix typo in url.md

"objg" -> "obj" in `URLPattern` constructor documentation.

Fixes: #57464
PR-URL: #57467
Co-authored-by: Lawlight <lawlight02@protonmail.com>
Reviewed-By: Jake Yuesong Li <jake.yuesong@gmail.com>
Reviewed-By: Daeyeon Jeong <daeyeon.dev@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>

Author: mureinik

doc/api/url.md

@@ -767,7 +767,7 @@ case-insensitive matching if set to true.
 
 The constructor can throw a `TypeError` to indicate parsing failure.
 
-#### `new URLPattern(objg[, baseURL][, options])`
+#### `new URLPattern(obj[, baseURL][, options])`
 
 * `obj` {Object} An input pattern
 * `baseURL` {string | undefined} A base URL string