Merge pull request #258 from PaddlePaddle/tink2123-patch-1

Update index_cn.rst

Author: tink2123

doc/fluid/index_cn.rst

@@ -11,7 +11,6 @@
     :maxdepth: 1
 
 
-    overview.md
     beginners_guide/index.rst
     user_guides/index.rst
     advanced_usage/index.rst