fix: update doc of kafka connector demo for #3993 (#3995)

Author: Shouren

docs/en/integration/online_datasources/kafka_connector_demo.md

@@ -41,7 +41,7 @@ If you are already familiar with Kafka and OpenMLDB and do not want to follow th
 ### Download and Preparation
 
 - If you need to download Kafka, please click on the [Kafka Official Download](https://kafka.apache.org/downloads) link and download `kafka_2.13-3.1.0.tgz`.
-- If you need to download the connector package and its dependencies, please click on [kafka-connect-jdbc-10.5.0-SNAPSHOT-0.8.5.tgz](https://openmldb.ai/download/kafka-connector/kafka-connect-jdbc-10.5.0-SNAPSHOT-0.8.5.tgz).
+- If you need to download the connector package and its dependencies, please check [kafka-connector](https://openmldb.ai/download/kafka-connector/) and choose the compatible connector package.
 - If you need to download the configuration and script files required in this article, please click on [kafka_demo_files.tgz](http://openmldb.ai/download/kafka-connector/kafka_demo_files.tgz).
 
 This article will use Docker mode to start OpenMLDB, so there is no need to download OpenMLDB separately. Additionally, both Kafka and the connector can be started in the same container.

docs/zh/integration/online_datasources/kafka_connector_demo.md

@@ -40,7 +40,7 @@ Kafka利用OpenMLDB Kafka Connector导入数据到OpenMLDB集群，其性能将
 ### 下载与准备
 
 - 你需要下载kafka，请点击[kafka官网下载](https://kafka.apache.org/downloads)下载kafka_2.13-3.1.0.tgz。
-- 你需要下载connector包以及依赖，请点击[kafka-connect-jdbc-10.5.0-SNAPSHOT-0.8.5.tgz](https://openmldb.ai/download/kafka-connector/kafka-connect-jdbc-10.5.0-SNAPSHOT-0.8.5.tgz)。
+- 你需要下载connector包以及依赖，请在 [kafka-connect-jdbc](https://openmldb.ai/download/kafka-connector/) 中选择合适 connector 的版本。
 - 你需要下载本文中所需要的配置与脚本等文件，请点击[kafka_demo_files.tgz](https://openmldb.ai/download/kafka-connector/kafka_demo_files.tgz)下载。
 
 本文将使用docker方式启动OpenMLDB，所以无需单独下载OpenMLDB。并且，kafka与connector的启动，都可以在同一个容器中进行。
@@ -263,4 +263,4 @@ kubectl create -f ./openmldb-kafka-connect-deployment.yaml
 
 ```
 kubectl create -f ./openmldb-kafka-connect-service.yaml
-```
+```