[zh] Update labels-annotations-taints/_index.md

[windsonsea]

• Fix issues mentioned in [zh] Add text to: labels-annotations-taints/_index.md #49290 (comment)
• Adjust some layout for long commented paras

[k8s-ci-robot]

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[tengqm]

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 6ce12733fb1963ff5dffbc3f7c1af489ad4bbd6e