add_toctree (#445)

doc/fluid/api_cn/api_guides/index.rst

@@ -13,3 +13,6 @@ API使用指南
     low_level/model_save_reader.rst
     low_level/inference.rst
     low_level/distributed/index.rst
+    low_level/memory_optimize.rst
+    low_level/nets.rst
+    low_level/parallel_executor.rst

doc/fluid/api_cn/api_guides/low_level/distributed/index.rst

@@ -5,7 +5,10 @@
 ..  toctree::
     :maxdepth: 1
 
+    sync_training.rst
     async_training.rst
     cpu_train_best_practice.rst
     large_scale_sparse_feature_training.rst
+    cluster_train_data_cn.rst
+
 

doc/fluid/api_cn/api_guides/low_level/layers/index.rst

@@ -15,4 +15,7 @@
     data_in_out.rst
     control_flow.rst
     sparse_update.rst
-    
+    data_feeder.rst
+    learning_rate_scheduler.rst
+    tensor.rst
+