Created by: wanghuancoder

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Describe

根据2.0API要求，修改paddle.nn.ParameterList和paddle.nn.LayerList代码示例 文档预览图较大，预览链接如下： http://gzhxy-inf-bce36a39de.gzhxy.baidu.com:8121/documentation/docs/en/api/paddle/fluid/dygraph/container/LayerList_en.html http://gzhxy-inf-bce36a39de.gzhxy.baidu.com:8121/documentation/docs/en/api/paddle/fluid/dygraph/container/ParameterList_en.html