update doc

arthas-tutorials.html

@@ -54,7 +54,7 @@
             <div class="collapse navbar-collapse" id="navbarSupportedContent">
                 <ul class="navbar-nav mr-auto">
                     <li class="nav-item">
-                        <a class="nav-link" href="https://alibaba.github.io/arthas" target="_blank">Documentation
+                        <a class="nav-link" v-bind:href="docUrl()" target="_blank">Documentation
                             <span class="sr-only">(current)</span></a>
                     </li>
                     <li class="nav-item">
@@ -168,6 +168,13 @@
                 var url = this.currentUrl();
                 return url.substring(0, url.lastIndexOf('/')) + "/_static/logo.png";
             },
+            docUrl: function () {
+                if (this.language === "en") {
+                    return "https://alibaba.github.io/arthas/en";
+                } else {
+                    return "https://alibaba.github.io/arthas";
+                }
+            },
             currentTutorialName: function () {
                 for (index in this.tutorials) {
                     if (this.tutorials[index].id == this.tutorialId) {