[ko] Update outdated files dev-1.24-ko.2 (M51-M53)

[yoonian]

Related issue: #34903 (dev-1.24-ko.2)

Fix outdated Korean contents associated with the following files.

• M51. content/en/docs/contribute/review/reviewing-prs.md | 53(+M) 34(-)
• M52. content/en/docs/contribute/suggesting-improvements.md | 1(+XS) 0(-)
• M53. content/en/docs/home/supported-doc-versions.md | 5(+XS) 0(-)

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[seokho-son]

/assign @seokho-son

[seokho-son]

Thank you @yoonian !

/lgtm
/approve

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 72f1dcecb8935d70b488f11550993a36f77e89ae

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: seokho-son

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