Merge pull request #12491 from taosdata/docs/wade-20220515

docs: English version of apt-get install

docs-en/03-get-started/_apt_get_install.mdx

-可以使用 apt-get 工具从官方仓库安装。
+`apt-get` can be used to install TDengine from official package repository. 
 
-**安装包仓库**
+**Package Repository**
 
 ```
 wget -qO - http://repos.taosdata.com/tdengine.key | sudo apt-key add -
 echo "deb [arch=amd64] http://repos.taosdata.com/tdengine-stable stable main" | sudo tee /etc/apt/sources.list.d/tdengine-stable.list
 ```
 
-如果安装 Beta 版需要安装包仓库
+The repository required for installing beta versions is as below:
 
 ```
 echo "deb [arch=amd64] http://repos.taosdata.com/tdengine-beta beta main" | sudo tee /etc/apt/sources.list.d/tdengine-beta.list
 ```
 
-**使用 apt-get 命令安装**
+**Install With apt-get**
 
 ```
 sudo apt-get update
@@ -22,5 +22,5 @@ sudo apt-get install tdengine
 ```
 
 :::tip
-apt-get 方式只适用于 Debian 或 Ubuntu 系统
+`apt-get` can only be used on Debian or Ubuntu Linux.
 ::::