Docs: Documentation improvement

[cptbtptpbcptdtptp]

请在 7.15 号前完成对各自负责文档的更新，务必做到简单直观，可以借助 @MrKou47 训练的工具提升文档质量。

@cptbtptpbcptdtptp

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@eyworldwide

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@MrKou47

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@Sway007

• [x] #2167

@JujieX

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@zhuxudong

• [x] #2199
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@johanzhu

• [x] #2204
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@singlecoder

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@luzhuang

• [x] #2212
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@gz65555

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@GuoLei1990

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@All

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