Fix spelling

Author: Evan Owens

book/routing.rst

@@ -1132,7 +1132,7 @@ see :ref:`route-parameters-controller-arguments`.
 .. tip::
 
  The special ``$_route`` variable is set to the name of the route that was
- matced.
+ matched.
 
 You can even add extra information to your route definition and access it
 within your controller. For more information on this topic,