build: review readme

README-CN.md

@@ -161,12 +161,7 @@ git clone https://github.com/taosdata/TDengine.git
 cd TDengine
 ```
 
-Go 连接器和 Grafana 插件在其他独立仓库，如果安装它们的话，需要在 TDengine 目录下通过此命令安装：
-
-```bash
-git submodule update --init --recursive
-```
-
+Go 连接器和 Grafana 插件已移到其他独立仓库。
 如果使用 https 协议下载比较慢，可以通过修改 ~/.gitconfig 文件添加以下两行设置使用 ssh 协议下载。需要首先上传 ssh 密钥到 GitHub，详细方法请参考 GitHub 官方文档。
 
 ```

README.md

@@ -164,12 +164,7 @@ git clone https://github.com/taosdata/TDengine.git
 cd TDengine
 ```
 
-The connectors for go & Grafana and some tools have been moved to separated repositories,
-so you should run this command in the TDengine directory to install them:
-
-```bash
-git submodule update --init --recursive
-```
+The connectors for go & Grafana and some tools have been moved to separated repositories.
 
 You can modify the file ~/.gitconfig to use ssh protocol instead of https for better download speed. You need to upload ssh public key to GitHub first. Please refer to GitHub official documentation for detail.