Merge pull request #5960 from kenjis/fix-docs-routing.rst

docs: small improvements in routing.rst

Author: kenjis

user_guide_src/source/incoming/routing.rst

@@ -193,7 +193,7 @@ a simple view:
 
 .. literalinclude:: routing/020.php
 
-Mapping multiple routes
+Mapping Multiple Routes
 =======================
 
 While the ``add()`` method is simple to use, it is often handier to work with multiple routes at once, using
@@ -351,7 +351,8 @@ See :doc:`Controller filters <filters>` for more information on setting up filte
     in which case the filter you specified to the route will not be applied.
     See :ref:`use-defined-routes-only` to disable auto-routing.
 
-**Alias filter**
+Alias Filter
+^^^^^^^^^^^^
 
 You specify an alias defined in **app/Config/Filters.php** for the filter value:
 
@@ -361,13 +362,15 @@ You may also supply arguments to be passed to the alias filter's ``before()`` an
 
 .. literalinclude:: routing/035.php
 
-**Classname filter**
+Classname Filter
+^^^^^^^^^^^^^^^^
 
 You specify a filter classname for the filter value:
 
 .. literalinclude:: routing/036.php
 
-**Multiple filters**
+Multiple Filters
+^^^^^^^^^^^^^^^^
 
 .. important:: *Multiple filters* is disabled by default. Because it breaks backward compatibility. If you want to use it, you need to configure. See :ref:`upgrade-415-multiple-filters-for-a-route` for the details.