docs: make titles ucfirst

Author: kenjis

user_guide_src/source/incoming/routing.rst

@@ -445,7 +445,7 @@ be used when the first parameter is a language string:
 
 .. _routing-priority:
 
-Route processing queue
+Route Processing Queue
 ----------------------
 
 When working with modules, it can be a problem if the routes in the application contain wildcards.
@@ -528,7 +528,7 @@ a valid class/method pair, just like you would show in any route, or a Closure:
     will be returned. See :php:func:`Response::setStatusCode() <setStatusCode>` for
     information on how to set the status code.
 
-Route processing by priority
+Route Processing by Priority
 ============================
 
 Enables or disables processing of the routes queue by priority. Lowering the priority is defined in the route option.