update doc

en/save-log.html

@@ -296,7 +296,12 @@ cache location  : /Users/zhuyong/logs/arthas-cache/28198/2</pre></div>
   var _hmt = _hmt || [];
   (function() {
     var hm = document.createElement("script");
-    hm.src = "https://hm.baidu.com/hm.js?d5c5e25b100f0eb51a4c35c8a86ea9b4";
+    if (window.location.hostname == "arthas.gitee.io") {
+      hm.src = "https://hm.baidu.com/hm.js?ecc1b0d9aeb73da1671876133211d4d3";
+    } else { // https://alibaba.github.io/arthas/
+      hm.src = "https://hm.baidu.com/hm.js?d5c5e25b100f0eb51a4c35c8a86ea9b4";
+    }
+
     var s = document.getElementsByTagName("script")[0]; 
     s.parentNode.insertBefore(hm, s);
   })();