Remove "Returns" headings [ci-skip]

We typically do not include "Returns" sections in method docs.

Author: jonathanhefner

actionpack/lib/abstract_controller/base.rb

@@ -86,14 +86,10 @@ def internal_methods
         controller.public_instance_methods(true) - methods
       end
 
-      # A list of method names that should be considered actions. This includes all
+      # A `Set` of method names that should be considered actions. This includes all
       # public instance methods on a controller, less any internal methods (see
       # internal_methods), adding back in any methods that are internal, but still
       # exist on the class itself.
-      #
-      # #### Returns
-      # *   `Set` - A set of all methods that should be considered actions.
-      #
       def action_methods
         @action_methods ||= begin
           # All public instance methods of this class, including ancestors except for
@@ -121,9 +117,6 @@ def clear_action_methods!
       #
       #     MyApp::MyPostsController.controller_path # => "my_app/my_posts"
       #
-      # #### Returns
-      # *   `String`
-      #
       def controller_path
         @controller_path ||= name.delete_suffix("Controller").underscore unless anonymous?
       end
@@ -151,10 +144,6 @@ def eager_load! # :nodoc:
     # The actual method that is called is determined by calling #method_for_action.
     # If no method can handle the action, then an AbstractController::ActionNotFound
     # error is raised.
-    #
-    # #### Returns
-    # *   `self`
-    #
     def process(action, ...)
       @_action_name = action.to_s