fix doc download link

site/src/site/sphinx/en/install-detail.md

@@ -56,7 +56,7 @@ $ java -jar arthas-boot.jar -h
 
 ## Offline Help Documentation
 
-Latest Version, Click To Download:[![Arthas](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)
+Latest Version, Click To Download:[![Arthas](https://img.shields.io/maven-central/v/com.taobao.arthas/arthas-packaging.svg?style=flat-square "Arthas")](https://github.com/alibaba/arthas/releases/download/arthas-all-3.0.5/arthas-3.0.5-doc.zip)
 
 
 ## Uninstall

site/src/site/sphinx/install-detail.md

@@ -59,8 +59,7 @@ $ java -jar arthas-boot.jar -h
 
 ## 离线帮助文档
 
-最新版本，点击下载：[![Arthas](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)
-
+最新版本，点击下载：[![Arthas](https://img.shields.io/maven-central/v/com.taobao.arthas/arthas-packaging.svg?style=flat-square "Arthas")](https://github.com/alibaba/arthas/releases/download/arthas-all-3.0.5/arthas-3.0.5-doc.zip)
 
 ## 卸载