Removed cool tier limitation from vaulted backup

[troyhite]

Cool tier blobs are support in Vaulted backup now.

[prmerger-automator]

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

[learn-build-service-prod]

Learn Build status updates of commit 568bf9c:

✅ Validation status: passed

File	Status	Preview URL	Details
articles/backup/blob-backup-support-matrix.md	✅Succeeded

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[v-dirichards]

@jyothisuri

Can you review the proposed changes?

Important: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged"
@MicrosoftDocs/public-repo-pr-review-team

[AbhishekMallick01]

Hi @troyhite - This update is already done in the doc with more details . So, closing this PR. Please review the doc updates done. Thanks

[prmerger-automator]

Invalid command: '#please-close'. Only Microsoft employees can use this command.

[prmerger-automator]

Invalid command: '#please-close'. Only Microsoft employees can use this command.

[SnehaSudhirG]

#please-close