Fix missing code block ending

... and reword a heading

README.md

@@ -265,7 +265,7 @@ class ApplicationPolicy
 end
 ```
 
-## Rescuing `Pundit::NotAuthorizedError` in Rails
+## Rescuing a denied Authorization in rails
 
 Pundit raises a `Pundit::NotAuthorizedError` you can [rescue_from](http://guides.rubyonrails.org/action_controller_overview.html#rescue_from) in your `ApplicationController`. You can customize the `user_not_authorized` method in every controller.
 
@@ -283,6 +283,7 @@ class ApplicationController < ActionController::Base
     redirect_to request.headers["Referer"] || root_path
   end
 end
+```
 
 ## Manually retrieving policies and scopes