i just want to understand

according to man 5 users,

the DEFAULT Auth-Type = LDAP   means that for  all  users  reaching  this entry, perform authentication against LDAP,  process any following entries which may match.

so why i got an unknown value LDAP for attribute Auth-Type ?
knowing that in my authenticate section i got
 Auth-Type LDAP {
                ldap
        }

and autorize section i got ldap too.

thank u to help me understand that.