Use h1 for titles.

actionpack/lib/action_dispatch/routing.rb

@@ -3,7 +3,7 @@ require 'active_support/core_ext/regexp'
 require 'action_controller/polymorphic_routes'
 
 module ActionDispatch
-  # == Routing
+  # = Routing
   #
   # The routing module provides URL rewriting in native Ruby. It's a way to
   # redirect incoming requests to controllers and actions. This replaces