docs: Fix bug 9809 -- missing entry in specfile

Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Karolin Seeger <kseeger@samba.org>

Autobuild-User(master): Karolin Seeger <kseeger@samba.org>
Autobuild-Date(master): Mon Apr 22 11:35:52 CEST 2013 on sn-devel-104
s3:utils/dbwrap_tool add exists operation

Signed-off-by: Christian Ambach <ambi@samba.org>
Reviewed-by: Volker Lendecke <vl@samba.org>
docs-xml: document dbwrap_tool exists

Signed-off-by: Christian Ambach <ambi@samba.org>
Reviewed-by: Volker Lendecke <vl@samba.org>

Autobuild-User(master): Volker Lendecke <vl@samba.org>
Autobuild-Date(master): Mon Apr 22 18:43:42 CEST 2013 on sn-devel-104