添加dstack英文文档

[yeteye]

PR Category

User Experience

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Others

Description

给 dstack 函数补充了英文版图例介绍，此前对应的中文版本已成功合入
PaddlePaddle/docs#6842

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[sunzhongkai588]

LGTM

[luotao1]

请通过CodeStyle流水线

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