[Docathon][Add API Legend No.24]

[EgoistSA]

为 slice_scatter API 添加图例 @sunzhongkai588 @zoooo0820

[paddle-bot[bot]]

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[luotao1]

@EgoistSA 冲突了

[CLAassistant]

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1 out of 2 committers have signed the CLA.

:white_check_mark: sunzhongkai588
:x: EgoistSA
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[sunzhongkai588]

与 https://github.com/PaddlePaddle/docs/pull/6837 一致，close