fix: use Router in text

Co-authored-by: kenjis <kenji.uui@gmail.com>

user_guide_src/source/incoming/routing.rst

@@ -157,7 +157,7 @@ Retrieving the Controller and Method Names
 In some cases, you might need to determine which controller and method have been triggered by the current HTTP request.
 This can be useful for logging, debugging, or conditional logic based on the active controller method.
 
-CodeIgniter 4 provides a simple way to access the current route's controller and method names using the ``Services::router()`` class. Here is an example:
+CodeIgniter 4 provides a simple way to access the current route's controller and method names using the ``Router`` class. Here is an example:
 
 .. literalinclude:: routing/071.php