Add fluid.rst (#2316)

* Add fluid.rst

* fix cn rst

doc/fluid/api/gen_index.py

@@ -27,14 +27,14 @@ API Reference
             file_names.extend(glob.glob(pattern))
 
         for file_name in sorted(file_names):
-            with open(file_name, 'r')as f:
+            with open(file_name, 'r') as f:
                 for i in range(2):
                     line = f.readline().strip()
                     if line.find('paddle.') != -1:
-                        file_object.write('    '+file_name + "\n")
+                        file_object.write('    ' + file_name + "\n")
                         file_names.remove(file_name)
 
-        file_object.write('    '+'fluid.rst' + "\n")
+        file_object.write('    ' + 'fluid.rst' + "\n")
         for file_name in sorted(file_names):
-            if file_name not in ['index_en.rst', 'fluid.rst']:
-                file_object.write('    '+file_name + "\n")
+            if file_name not in ['index_en.rst']:
+                file_object.write('    ' + file_name + "\n")

doc/fluid/api/index_en.rst

@@ -6,15 +6,29 @@ API Reference
     :maxdepth: 1
 
     ../api_guides/index_en.rst
-    paddle.rst
     dataset.rst
-    tensor.rst
-    nn.rst
-    imperative.rst
     declarative.rst
-    optimizer.rst
-    metric.rst
     framework.rst
+    imperative.rst
     io.rst
-    utils.rst
-    incubate.rst
+    metric.rst
+    nn.rst
+    optimizer.rst
+    tensor.rst
+    fluid.rst
+    backward.rst
+    clip.rst
+    data/data_reader.rst
+    data/dataset.rst
+    dygraph.rst
+    executor.rst
+    fluid.rst
+    initializer.rst
+    layers.rst
+    metrics.rst
+    nets.rst
+    paddle.rst
+    profiler.rst
+    regularizer.rst
+    transpiler.rst
+    unique_name.rst

doc/fluid/api_cn/index_cn.rst

@@ -107,3 +107,21 @@ Note。
     io_cn.rst
     utils_cn.rst
     incubate_cn.rst
+    fluid_cn.rst
+    backward_cn.rst
+    clip_cn.rst
+    data_cn/data_reader_cn.rst
+    data_cn/dataset_cn.rst
+    dataset_cn.rst
+    dygraph_cn.rst
+    executor_cn.rst
+    initializer_cn.rst
+    io_cn.rst
+    layers_cn.rst
+    metrics_cn.rst
+    nets_cn.rst
+    optimizer_cn.rst
+    profiler_cn.rst
+    regularizer_cn.rst
+    transpiler_cn.rst
+    unique_name_cn.rst