AKS backup related update

[rajats22]

Signoff for AKS Backup related document udpates

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@rajats22 : Thanks for your contribution! The author(s) have been notified to review your proposed change.

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Learn Build status updates of commit 0c16db7:

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articles/backup/azure-kubernetes-service-cluster-backup-concept.md	:white_check_mark:Succeeded

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[Court72]

@AbhishekMallick-MS

Can you review the proposed changes?

When the changes are ready for publication, add a #sign-off comment to signal that the PR is ready for the review team to merge.

label:"aq-pr-triaged"

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