Update architecture.md

[SwapnaKotagiri]

Adding a new region "UAE North" to the supported regions.

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

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[ShannonLeavitt]

@jjaygbay1

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

[jjaygbay1]

sign-off