Design doc for idrange option "auto-private-groups"
    
    Related: https://pagure.io/freeipa/issue/8807
    Signed-off-by: Florence Blanc-Renaud <flo@redhat.com>
    Reviewed-By: Rob Crittenden <rcritten@redhat.com>
    Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>