Update help messages with new wording (#8616)

Final update to all messages across sub-systems
after final review, the only change here is that
NATS now has TLS and TLSSkipVerify to be consistent
for all other notification targets.

cmd/config/notify/legacy.go

@@ -422,7 +422,11 @@ func SetNotifyNATS(s config.Config, natsName string, cfg target.NATSArgs) error
 			Value: cfg.ClientKey,
 		},
 		config.KV{
-			Key:   target.NATSSecure,
+			Key:   target.NATSTLS,
+			Value: config.FormatBool(cfg.Secure),
+		},
+		config.KV{
+			Key:   target.NATSTLSSkipVerify,
 			Value: config.FormatBool(cfg.Secure),
 		},
 		config.KV{