docs: refine python and java connect tutorial

docs-en/05-develop/01-connect/01-python.md

@@ -31,6 +31,8 @@ You should replace above placeholders as real values. To obtain these values, pl
 
 ## Connect
 
+Copy code bellow to your editor and run it with `python3` command.
+
 ```python
 import taosrest
 import os
@@ -41,4 +43,4 @@ token = os.environ["TDENGINE_CLOUD_TOKEN"]
 conn = taosrest.connect(url=url, token=token)
 ```
 
-The client connection is then established. For how to write data and query data, please refer to [basic usage](../../connector/python#basic-usage).
+The client connection is then established. For how to write data and query data, please refer to [sample-program](https://docs.tdengine.com/cloud/connector/python/#sample-program).

docs-en/05-develop/01-connect/02-java.md

@@ -42,6 +42,8 @@ You should replace above placeholders as real values. To obtain these values, pl
 
 ## Connect
 
+Code bellow get variable URL and token from environment first and then create a `RestfulConnection` object, witch is a standard JDBC Connection object.
+
 ```java
 import com.taosdata.jdbc.rs.RestfulConnection;
 import java.sql.Connection;
@@ -51,10 +53,9 @@ public class ConnectCloudExample {
     public static void main(String[] args) throws Exception {
         String url = System.getenv("TDENGINE_CLOUD_URL");
         String token = System.getenv("TDENGINE_CLOUD_TOKEN");
-        // create a standard JDBC connection.
         Connection conn = new RestfulConnection(url, token);
     }
 }
 ```
 
-The client connection is then established.
\ No newline at end of file
+The client connection is then established. For how to write data and query data using the connection, please refer to [usage-examples](https://docs.tdengine.com/reference/connector/java#usage-examples).
\ No newline at end of file

docs-en/09-connector/python.md

@@ -71,7 +71,7 @@ For a more detailed description of the `sql()` method, please refer to [RestClie
 | ----------------- | ----------------------------------------- | ------------ |
 | 2.3.3             | support connect to TDengine Cloud Service | 2022-06-06   |
 
-[**Release Notes**] (https://github.com/taosdata/taos-connector-python/releases)
+[**Release Notes**](https://github.com/taosdata/taos-connector-python/releases)
 
 ## API Reference