Fix formatting in Azure Resource Graph query example

[luisfeliz79]

Resource Graph KQL query for the resources table should start with a lowercase "r", otherwise it leads to an error

[prmerger-automator]

@luisfeliz79 : Thanks for your contribution! The author(s) and reviewer(s) have been notified to review your proposed change. @gtrossell

[learn-build-service-prod]

Learn Build status updates of commit dfbdc8a:

✅ Validation status: passed

File	Status	Preview URL	Details
articles/storage/common/legacy-blob-storage-account-migration-overview.md	✅Succeeded

For more details, please refer to the build report.

[ktoliver]

@gtrossell-eng

Can you review the proposed changes? Also, if you are the article author, would you please update the metadata author value to your current GitHub account in a new PR in the private repo? Thanks.

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

[gtrossell-eng]

#sign-off

[prmerger-automator]

Invalid command: '#sign-off'. Only the assigned author of one or more file in this PR can sign off. @gtrossell

[gtrossell-eng]

@luisfeliz79 - approved please sign off

[gtrossell-eng]

#sign-off

[prmerger-automator]

Invalid command: '#sign-off'. Only the assigned author of one or more file in this PR can sign off. @gtrossell