docs: Avoid mentioning a possibly misleading option.

Reviewed-by: Andrew Bartlett <abartlet@samba.org>
(cherry picked from commit 5528551ea39686194837a8083c85b71dedbe6f0e)

Fix bug #9964 - For v4-0-test: docs: Avoid mentioning a possibly misleading
option.

Autobuild-User(v4-0-test): Karolin Seeger <kseeger@samba.org>
Autobuild-Date(v4-0-test): Fri Jun 21 11:41:46 CEST 2013 on sn-devel-104