[zh] remove cluster-autoscaling.md and update a few text

[windsonsea]

modified:   content/zh-cn/docs/concepts/cluster-administration/_index.md
deleted:    content/zh-cn/docs/concepts/cluster-administration/cluster-autoscaling.md

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[tengqm]

? This PR only contains one file.

[windsonsea]

Just rebased with #50208.

This can be a follow-up of #50166.

[howieyuen]

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 87cad04b63b869b49630b90a158416f1c1ff4fe1

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