Update KEP-3022 based on the latest implementation

[sanposhiho]

• One-line PR description: Update KEP-3022 based on the latest implementation

• Issue link: Min domains in PodTopologySpread #3022

• Other comments:

[alculquicondor]

/lgtm
/approve

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This pull-request has been approved by: alculquicondor, sanposhiho

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[alculquicondor]

If the API changes are not significant and don't change the behavior of the feature, we generally don't update the KEP.

[sanposhiho]

If the API changes are not significant and don't change the behavior of the feature, we generally don't update the KEP.

Got it, thanks.