plugin command dns: small naming fixes

refs #6487

Author: Michael Friedrich

doc/6-configuring-icinga-2.md

@@ -2077,7 +2077,7 @@ snmp_address    | **Optional.** The host's address. Defaults to "$address$".
 snmp_oid        | **Optional.** The SNMP OID. Defaults to "1.3.6.1.2.1.1.3.0".
 snmp_community  | **Optional.** The SNMP community. Defaults to "public".
 
-#### <a id="plugin-check-command-dhcp"></a> dhcp
+#### <a id="plugin-check-command-dns"></a> dns
 
 Check command object for the `check_dns` plugin.
 
@@ -2088,9 +2088,9 @@ Name                 | Description
 dns_lookup           | **Optional.** The hostname or IP to query the dns for. Defaults to $host_name$.
 dns_server           | **Optional.** The DNS server to query. Defaults to the server configured in the OS.
 dns_expected_answer  | **Optional.** The answer to look for. A hostname must end with a dot.
-dns_authorative      | **Optional.** Expect the server to send an authorative answer.
+dns_authoritative    | **Optional.** Expect the server to send an authoritative answer.
 
-#### <a id="plugin-check-command-dns"></a> dns
+#### <a id="plugin-check-command-dhcp"></a> dhcp
 
 Check command object for the `check_dhcp` plugin.
 

itl/command-plugins.conf

@@ -433,7 +433,7 @@ object CheckCommand "dns" {
 		"-s" = "$dns_server$",
 		"-a" = "$dns_expected_answer$",
 		"-A" = {
-			set_if = "$dns_authorative$"
+			set_if = "$dns_authoritative$"
 		}
 	}