[Outlook](NAA) add testing guidance to FAQ

[davidchesnut]

Adding testing guidance for NAA add-ins for Outlook on Windows versions.

[learn-build-service-prod]

Learn Build status updates of commit da96626:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/outlook/faq-nested-app-auth-outlook-legacy-tokens.md	✅Succeeded	View

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[lindalu-MSFT]

Can you verify line 257 (unedited) should be heading 2? I just noticed when I was previewing that it seems out of place. Should this be heading 3 under Developer Questions?

[learn-build-service-prod]

Learn Build status updates of commit 12c8624:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/outlook/faq-nested-app-auth-outlook-legacy-tokens.md	✅Succeeded	View

For more details, please refer to the build report.

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• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[learn-build-service-prod]

Learn Build status updates of commit ef15c4c:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/outlook/faq-nested-app-auth-outlook-legacy-tokens.md	✅Succeeded	View

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel