Document URL: 
https://docs.openshift.com/container-platform/3.7/admin_guide/manage_users.html#admin-guide-managing-users-creating-groups

Describe the issue: 
dedicated-admins are able to create and manage groups, and therefore, this information should be present in the dedicated docs at https://docs.openshift.com/dedicated/admin_guide/manage_users.html#admin-guide-managing-users-creating-groups