[release-0.18] Update Cert Renewal Docs

[eks-distro-pr-bot]

This is an automated cherry-pick of #8100

/assign tatlat

[eks-distro-bot]

Hi @eks-distro-pr-bot. Thanks for your PR.

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[tatlat]

/ok-to-test
/approve
/lgtm

[eks-distro-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: tatlat

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