update doc

site/src/site/sphinx/download.md

@@ -3,6 +3,8 @@
 
 ## 下载全量包
 
+### 从Maven仓库下载
+
 最新版本，点击下载：[![](https://img.shields.io/maven-central/v/com.taobao.arthas/arthas-packaging.svg?style=flat-square "Arthas")](http://repository.sonatype.org/service/local/artifact/maven/redirect?r=central-proxy&g=com.taobao.arthas&a=arthas-packaging&e=zip&c=bin&v=LATEST)
 
 
@@ -10,6 +12,11 @@
 
 https://maven.aliyun.com/repository/public/com/taobao/arthas/arthas-packaging/3.x.x/arthas-packaging-3.x.x-bin.zip
 
+
+### 从Github Releases页下载
+
+[https://github.com/alibaba/arthas/releases](https://github.com/alibaba/arthas/releases)
+
 ### 用as.sh启动
 
 解压后，在文件夹里有`as.sh`，直接用`./as.sh`的方式启动：

site/src/site/sphinx/en/download.md

@@ -3,9 +3,15 @@ Download
 
 ## Download full package
 
+### Dwonload from maven central
+
 Latest Version, Click To Download: [![](https://img.shields.io/maven-central/v/com.taobao.arthas/arthas-packaging.svg?style=flat-square "Arthas")](http://repository.sonatype.org/service/local/artifact/maven/redirect?r=central-proxy&g=com.taobao.arthas&a=arthas-packaging&e=zip&c=bin&v=LATEST)
 
 
+### Download from Github Releases
+
+[https://github.com/alibaba/arthas/releases](https://github.com/alibaba/arthas/releases)
+
 ### Use as.sh
 
 Download and unzip, find `as.sh` in the directory. Start it in bash: