[doc] Authentication en Preferences with LDAP

[Wim]

Hi,

When I try to setup Authencation and Preferences with LDAP I dont find a 
part of the documentation I followed under 
http://wiki.horde.org/NewLDAPHowTo

When I go in the Horde Setup to configure Groups as describded in the docs I 
only find :

 What backend should we use for Horde Groups? Datatree or Hooks.

I am using Horde 3.0.4

Do I miss something?

Many thanks and greetz,

Wim