[Samba] Samba documentation team

[Klaus Hartnegg]

> How about removing anything to do with setting up a NT4 domain and restricting mention of it to migrating from an NT4 domain to an AD domain.

The documentation should document the product. A large part of the product is non-AD, for very good reasons. The AD part is not even complete yet. It is unrealistic to assume that a large fraction of the users will switch to AD mode anytime soon.