fix a wrong link

docs/jflow_quickstart.html

@@ -40,7 +40,7 @@
         </div>
         <div class="navbar-collapse collapse">
           <ul class="nav navbar-nav">
-            <li><a href="./inde.htmlx">About</a></li>
+            <li><a href="./index.html">About</a></li>
             <li><a href="./jflow_install.html">Install</a></li>
             <li class="active"><a href="./jflow_quickstart.html">Quick start</a></li>
             <li class="dropdown">