MAN: Clarify the min_id/max_id limits further
    
    https://fedorahosted.org/sssd/ticket/2005
    
    Some users were confused by our description of min_id/max_id and thought
    the limits only applied to returning entries from the NSS responder.
    However, the limits are actually enforced on the back end side, so the
    entries are not even saved to cache.