doc: add reference to connect in data in/out

docs/en/07-data-in/01-insert-data.md

@@ -42,6 +42,11 @@ For more details about `INSERT` please refer to [INSERT](https://docs.tdengine.c
 
 ## Connector Examples
 
+:::note
+Before executing the sample code in this section, you need to firstly establish connection to TDegnine cloud service, please refer to [Connect to TDengine Cloud Service](../../programming/connect/).
+
+:::
+
 <Tabs>
 <TabItem value="python" label="Python">
 

docs/en/09-data-out/01-query-data.md

@@ -123,6 +123,11 @@ For more details please refer to [Aggregate by Window](https://docs.tdengine.com
 
 ## Connector Examples
 
+:::note
+Before executing the sample code in this section, you need to firstly establish connection to TDegnine cloud service, please refer to [Connect to TDengine Cloud Service](../../programming/connect/).
+
+:::
+
 <Tabs>
 <TabItem value="python" label="Python">