fix typo in backup-azure-troubleshoot-blob-backup.md

[User670]

[prmerger-automator[bot]]

@User670 : Thanks for your contribution! The author(s) have been notified to review your proposed change.

[learn-build-service-prod[bot]]

Learn Build status updates of commit aed75f2:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
articles/backup/backup-azure-troubleshoot-blob-backup.md	:white_check_mark:Succeeded

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[Court72]

@AbhishekMallick-MS

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

[ShannonLeavitt]

@AbhishekMallick-MS @JYOTHIRMAISURI

Can you review this old PR and determine whether it needs to be closed or merged?

IMPORTANT: When the changes are ready for publication, add a #sign-off comment to signal that the PR is ready for the PR Review team to review and merge. If the changes no longer apply, add an explanation and a #please-close comment to close the PR.

@MicrosoftDocs/public-repo-pr-review-team

[v-ccolin]

@AbhishekMallick-MS @JYOTHIRMAISURI

Can you respond to the comment above?

@MicrosoftDocs/public-repo-pr-review-team

[AbhishekMallick-MS]

#sign-off