Update sql-server-backup-to-url.md to correct example T-SQL

[rambabu-yalla]

Removed WITH FORMAT from Backup to URL statement in the Backup to Immutable container section

[prmerger-automator]

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

[Court72]

@dplessMSFT

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

[v-dirichards]

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After you make your changes in the private repo, review the articles on staging, and fix any validation issues, you can add the sign-off comment to let PR reviewers know that the updates are ready to be merged.

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