fix typo test=develop (#1480)

doc/fluid/api_cn/layers_cn/create_tensor_cn.rst

@@ -26,11 +26,11 @@ create_tensor
     type: LOD_TENSOR
     lod_tensor {
         tensor {
-        data_type: INT8
+        data_type: FP32
         }
     }
     }
     persistable: false
     """
     import paddle.fluid as fluid
-    tensor = fluid.layers.create_tensor(dtype='float32')
+    tensor = fluid.layers.create_tensor(dtype='float32')
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