Fix internal documents.

doc/build/index.rst

@@ -9,6 +9,7 @@ Install PaddlePaddle
     :glob:
 
     install_*
+    internal/install_from_jumbo.md
 
 Build from Source
 -----------------

doc/cluster/index.rst

@@ -5,3 +5,4 @@ Cluster Train
   :glob:
 
   opensource/cluster_train.md
+  internal/index.md

doc_cn/build_and_install/index.rst

@@ -9,7 +9,11 @@ Note: The intallation packages are still in pre-release state and your experienc
 
 .. toctree::
    :maxdepth: 1
+   :glob:
    
+   源码下载(对内) <../build/internal/download_paddle_source_zh_cn.rst>
+   使用Jumbo安装(对内) <../build/internal/install_from_jumbo.rst>
+   从源码编译安装(对内)  <../build/internal/build_from_source_zh_cn.rst>
    install/docker_install.rst 
    install/ubuntu_install.rst
    cmake/index.rst

doc_cn/cluster/index.rst

+集群训练
+========
+
+* `集群训练 <../../doc/cluster/index.html>`_
+
+.. toctree::
+    :maxdepth: 2
+    :glob:
+
+    集群训练(对内) <internal/index.md>
+

doc_cn/index.rst

@@ -8,7 +8,7 @@ PaddlePaddle文档
 * `用户接口 <ui/index.html>`_
 * `使用示例 <demo/index.html>`_
 * `模型配置 <../doc/ui/api/trainer_config_helpers/index.html>`_
-* `集群训练 <../doc/cluster/index.html>`_
+* `集群训练 <cluster/index.html>`_
 
 开发指南
 --------