update doc

en/watch.html

@@ -179,7 +179,7 @@
         
             
             
-              <a href="https://github.com/alibaba/arthas/blob/master/site/src/site/sphinx/watch.md" class="fa fa-github"> Edit on GitHub</a>
+              <a href="https://github.com/alibaba/arthas/blob/master/site/src/site/sphinx/en/watch.md" class="fa fa-github"> Edit on GitHub</a>
             
           
         
@@ -571,7 +571,7 @@ ts=2017-10-31 18:46:17;result=@$Proxy131[
         var DOCUMENTATION_OPTIONS = {
             URL_ROOT:'./',
             VERSION:'3.0.5-SNAPSHOT',
-            LANGUAGE:'None',
+            LANGUAGE:'en',
             COLLAPSE_INDEX:false,
             FILE_SUFFIX:'.html',
             HAS_SOURCE:  true,