Merge pull request #63 from mylxsw/gh-pages

update index.zh_cn，update missing content - thanks to @mylxsw

index.zh_CN.html

@@ -217,8 +217,10 @@
         </p>
 
         <blockquote>
-            git flow feature pull MYFEATURE
+            git flow feature pull origin MYFEATURE
         </blockquote>
+        
+        <p>你可以使用 <code> git flow feature track MYFEATURE</code> 跟踪在origin上的特性分支。</p>
     </div>
     <div class="col-2">
         <div class="feature-pull"></div>