docs: fix description

Author: kenjis

user_guide_src/source/incoming/auto_routing_improved.rst

@@ -91,7 +91,7 @@ usually represent::
 
 1. The first segment represents the controller **class** that should be invoked.
 2. The second segment represents the class **method** that should be called.
-3. The third, and any additional segments, represent any **parameters** that will be passed to the controller.
+3. The third, and any additional segments, represent any **parameters** that will be passed to the controller method.
 
 Consider this URI::