update doc

site/src/site/sphinx/download.md

@@ -5,7 +5,24 @@
 
 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)
 
-解压后，在文件夹里有`arthas-boot.jar`，直接用`java -jar`的方式启动：
+
+### 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：
+
+```bash
+./as.sh
+```
+
+打印帮助信息：
+
+```bash
+./as.sh -h
+```
+
+### 用arthas-boot启动
+
+或者在解压后，在文件夹里有`arthas-boot.jar`，直接用`java -jar`的方式启动：
 
 ```bash
 java -jar arthas-boot.jar
@@ -17,6 +34,8 @@ java -jar arthas-boot.jar
 java -jar arthas-boot.jar -h
 ```
 
+
+
 ## 下载离线文档
 
 下载文档：[![](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=doc&v=LATEST)

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

@@ -5,6 +5,23 @@ Download
 
 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)
 
+
+### Use as.sh
+
+Download and unzip, find `as.sh` in the directory. Start it in bash:
+
+```bash
+./as.sh
+```
+
+Print usage:
+
+```bash
+./as.sh -h
+```
+
+### Use arthas-boot.jar
+
 Download and unzip, find `arthas-boot.jar` in the directory. Start with `java` command:
 
 ```bash