test=develop, fix doc(zh) of ConstantInitializer (#1697)

* test=develop, fix doc(zh) of ConstantInitializer

* test=develop, modify return doc for ConstantInitializer

* test=develop, modify comment

doc/fluid/api_cn/initializer_cn/ConstantInitializer_cn.rst

-.. _cn_api_fluid_initializer_ConstantInitializer:
-
-ConstantInitializer
--------------------------------
-
-.. py:class:: paddle.fluid.initializer.ConstantInitializer(value=0.0, force_cpu=False)
-
-该接口为常量初始化函数，用于权重初始化，通过输入的value值初始化输入变量；
-
-参数：
-        - **value** (float16|float32) - 用于初始化输入变量的值；
-
-返回：对象
-
-**代码示例**
-
-.. code-block:: python
-
-        import paddle.fluid as fluid
-        x = fluid.layers.data(name="data", shape=[32, 32], dtype="float32")
-        fc = fluid.layers.fc(input=x, size=10,
-            param_attr=fluid.initializer.ConstantInitializer(value=2.0))
-
-
-
-
-
-
+.. _cn_api_fluid_initializer_ConstantInitializer:
+
+ConstantInitializer
+-------------------------------
+
+.. py:class:: paddle.fluid.initializer.ConstantInitializer(value=0.0, force_cpu=False)
+
+该接口为常量初始化函数，用于权重初始化，通过输入的value值初始化输入变量；
+
+参数：
+        - **value** (float16|float32) - 用于初始化输入变量的值；
+        - **force_cpu** (bool) - 用于表示初始化的位置，为True时，会强制在CPU上初始化（即使executor设置的是CUDA）。默认为False。
+
+返回：参数初始化类的实例
+
+**代码示例**
+
+.. code-block:: python
+
+        import paddle.fluid as fluid
+        x = fluid.layers.data(name="data", shape=[32, 32], dtype="float32")
+        fc = fluid.layers.fc(input=x, size=10,
+            param_attr=fluid.initializer.ConstantInitializer(value=2.0))
+
+
+
+
+
+