Docs/sangshuduo/td 13307 add desc to index (#10321)

* [TD-13307]<docs>: add description to docs index.

* fix the link of how to use taosBenchmark

* fix wrong links

* fix markdown format

* refine getting started section

* update

* fix install doc link

documentation20/cn/02.getting-started/docs.md

@@ -26,7 +26,7 @@ TDengine 的安装非常简单，从下载到安装成功仅仅只要几秒钟
 
 <ul id="server-packageList" class="package-list"></ul>
 
-具体的安装过程，请参见 [TDengine 多种安装包的安装和卸载](https://www.taosdata.com/cn/documentation/install) 以及 [视频教程](https://www.taosdata.com/blog/2020/11/11/1941.html)。
+具体的安装过程，请参见 [TDengine 多种安装包的安装和卸载](https://www.taosdata.com/cn/getting-started/install) 以及 [视频教程](https://www.taosdata.com/blog/2020/11/11/1941.html)。
 
 ## 仅安装客户端
 

documentation20/en/02.getting-started/docs.md

@@ -26,7 +26,7 @@ TDengine is very easy to install, from download to successful installation in ju
 
 <ul id="server-packageList" class="package-list"></ul>
 
-For details of the installation process, please refer to [Installation and Uninstallation of TDengine Multiple Installers](https://www.taosdata.com/en/documentation/install).
+For details of the installation process, please refer to [How to install/uninstall TDengine with installation package](https://www.taosdata.com/en/getting-started/install).
 
 ## Install client only