update doc

en/index.html

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   <div class="section" id="arthas-documentation">
 <span id="arthas-documentation"></span><h1>Arthas Documentation<a class="headerlink" href="#arthas-documentation" title="Permalink to this headline">¶</a></h1>
+<p><strong><a class="reference external" href="https://alibaba.github.io/arthas/">中文文档/Chinese Docs</a></strong></p>
 <p><img alt="arthas" src="_images/arthas.png" /></p>
 <p><code class="docutils literal notranslate"><span class="pre">Arthas</span></code> is an Java Diagnostic tool open sourced by Alibaba.</p>
 <p>Arthas can help developer trouble-shooting production issues for Java applications without modifying your code or restating your server.</p>