update named-checkzone/rndc descriptions to 9.3 level.
update named-checkzone/rndc descriptions to 9.3 level.

pecharmin/bind9,each/bind9-collab,pecharmin/bind9,pecharmin/bind9,each/bind9-collab,each/bind9-collab,pecharmin/bind9,pecharmin/bind9,each/bind9-collab,pecharmin/bind9,each/bind9-collab,each/bind9-collab