Dynamic Configuration Zookeeper Implementation (#5040)

docs/en/setup/backend/dynamic-config.md

@@ -43,7 +43,6 @@ configuration:
 ```
 
 ## Dynamic Configuration Zookeeper Implementation
-
 [Zookeeper](https://github.com/apache/zookeeper) is also supported as DCC(Dynamic Configuration Center), to use it, please configure as follows:
 
 ```yaml
@@ -58,6 +57,8 @@ configuration:
     maxRetries: ${SW_CONFIG_ZK_MAX_RETRIES:3} # max number of times to retry
 ```
 
+The **nameSpace** is the ZooKeeper path. The config key and value are the properties of the `namespace` folder.
+
 ## Dynamic Configuration Etcd Implementation
 
 [Etcd](https://github.com/etcd-io/etcd) is also supported as DCC(Dynamic Configuration Center), to use it, please configure as follows: