update rst documents and images

[tngt]

information form chikai

[paddle-bot[bot]]

感谢你贡献飞桨文档，文档预览构建中，Docs-New 跑完后即可预览，预览链接：http://preview-pr-5764.paddle-docs-preview.paddlepaddle.org.cn/documentation/docs/zh/api/index_cn.html 预览工具的更多说明，请参考：飞桨文档预览工具

[paddle-bot[bot]]

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