[zh-cn]sync kubeadm/_index.md

[my-git9]

content/zh-cn/docs/tasks/administer-cluster/kubeadm/_index.md

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[tengqm]

/lgtm /approve

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LGTM label has been added.

Git tree hash: 6b3dcc4f7d7421c585a9cd6018ea56758e40ae36

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