Update azure-database-postgresql-limitations.md‎

[hamulante]

Remove duplicate data types in Column level limitations

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hamulante is beibeihu@microsoft from Azure PostgreSQL CSS team. Modify duplicate value, not technical part.

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[prmerger-automator]

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

[learn-build-service-prod]

Learn Build status updates of commit 567095c:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/mirroring/azure-database-postgresql-limitations.md	✅Succeeded

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[v-regandowner]

@whhender

Can you review the proposed changes?

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#label:"aq-pr-triaged"
@MicrosoftDocs/public-repo-pr-review-team

[prmerger-automator]

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