Update Azure OpenAI service entry and add Microsoft Foundry

[shmallad]

No description provided.

[prmerger-automator]

@shmallad : 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 e0cd70c:

⚠️ Validation status: warnings

File	Status	Preview URL	Details
articles/private-link/network-security-perimeter-concepts.md	⚠️Warning		Details

articles/private-link/network-security-perimeter-concepts.md

• Line 107, Column 3: [Warning: file-not-found - See documentation] Invalid file link: 'azure/ai-foundry/how-to/add-foundry-to-network-security-perimeter'.

For more details, please refer to the build report.

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[Copilot]

Pull request overview

This PR updates the Network Security Perimeter concepts documentation to clarify service entries for Azure OpenAI and adds support for Microsoft Foundry. The changes distinguish between different CognitiveServices resource kinds and add a new generally available service entry.

• Updated Azure OpenAI service entry to specify the "OpenAI" kind
• Added Microsoft Foundry as a new network security perimeter-aware service

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[v-dirichards]

@mbender-ms

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

[learn-build-service-prod]

Learn Build status updates of commit 7fdc59a:

✅ Validation status: passed

File	Status	Preview URL	Details
articles/private-link/network-security-perimeter-concepts.md	✅Succeeded

For more details, please refer to the build report.

[mbender-ms]

#sign-off

[learn-build-service-prod]

Learn Build status updates of commit 57cf97a:

✅ Validation status: passed

File	Status	Preview URL	Details
articles/private-link/network-security-perimeter-concepts.md	✅Succeeded

For more details, please refer to the build report.

[ktoliver]

#sign-off

[prmerger-automator]

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