Add configuration description

kvdb/etcd/config.go

@@ -14,7 +14,7 @@ type Config struct {
 
 	EmbeddedLogFile string `long:"embedded_log_file" description:"Optional log file to use for embedded instance logs. note: use for testing only."`
 
-	Host string `long:"host" description:"Etcd database host."`
+	Host string `long:"host" description:"Etcd database host. Supports multiple hosts separated by a comma."`
 
 	User string `long:"user" description:"Etcd database user."`
 

sample-lnd.conf

@@ -1374,7 +1374,7 @@
 
 [etcd]
 
-; Etcd database host.
+; Etcd database host. Supports multiple hosts separated by a comma.
 ; Default:
 ;   db.etcd.host=
 ; Example: