Update how-to-integrate-certificate-authority.md for CertCentral divisions missing support

[MarcoLodini]

CertCentral divisions are not supported using the Key Vault integration, resulting consistently in an error. Docs have been updated to reflect this problem.

[prmerger-automator]

@MarcoLodini : 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 25cca41:

✅ Validation status: passed

File	Status	Preview URL	Details
articles/key-vault/certificates/how-to-integrate-certificate-authority.md	✅Succeeded

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[v-dirichards]

@msmbaldwin

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

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