Update related to paddle.nn.data (#2427)

* modify nn.data into static.data

* Update index_cn.rst

* nn.data to static.data

* remove alias

doc/fluid/api_cn/fluid_cn/data_cn.rst

@@ -6,10 +6,6 @@ data
 
 .. py:function:: paddle.fluid.data(name, shape, dtype='float32', lod_level=0)
 
-:api_attr: 声明式编程模式（静态图)
-:alias_main: paddle.nn.data
-:alias: paddle.nn.data,paddle.nn.input.data
-:old_api: paddle.fluid.data
 
 
 

doc/fluid/beginners_guide/dygraph/DyGraph.md

@@ -55,8 +55,7 @@ import paddle
 from paddle.imperative import to_variable
 
 data = np.ones([2, 2], np.float32)
-#x = paddle.data(name='x', shape=[2,2], dtype='float32')
-x = paddle.nn.data(name='x', shape=[2,2], dtype='float32')
+x = paddle.static.data(name='x', shape=[2,2], dtype='float32')
 x += 10
 exe = paddle.Executor()
 exe.run(paddle.default_startup_program())

doc/fluid/beginners_guide/index_cn.rst

@@ -34,8 +34,8 @@
     import numpy
     import paddle
     # 定义输入数据占位符
-    a = paddle.nn.data(name="a", shape=[1], dtype='int64')
-    b = paddle.nn.data(name="b", shape=[1], dtype='int64')
+    a = paddle.static.data(name="a", shape=[1], dtype='int64')
+    b = paddle.static.data(name="b", shape=[1], dtype='int64')
     # 组建网络（此处网络仅由一个操作构成，即elementwise_add）
     result = paddle.elementwise_add(a, b)
     # 准备运行网络