use [[= user_doc =]] to fix 3.3 links

Author: adriendupuis

docs/guide/admin_panel.md

@@ -132,7 +132,7 @@ Content Types are organized into groups.
 
 You can add your own groups here to keep your Content Types in better order.
 
-For a full tutorial, see [Create a Content Type](first_steps.md#create-a-content-type) or follow [user documentation](https://doc.ezplatform.com/projects/userguide/en/latest/organizing_the_site/#content-types).
+For a full tutorial, see [Create a Content Type](first_steps.md#create-a-content-type) or follow [user documentation]([[= user_doc =]]/site_organization/organizing_the_site/#content-types).
 For a detailed overview of the content model, see [Content model overview](content_model.md).
 
 ## Object States