feat: enable the percentage limit feature

[felix021]

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feat

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en: Kitex v0.7.2 provides a new feature for precisely limiting the percentage of retry requests, which should be more practical than the old way (depending on the error rate), especially for backup request. Optimize the document by the way.
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[whalecold]

/lgtm

[whalecold]

/approve

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This pull-request has been approved by: felix021, whalecold

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