Update mac-preferences.md

[vegupta]

Added definitionUpdateInterval and proxy settings.

[learn-build-service-prod]

Learn Build status updates of commit 8412db6:

✅ Validation status: passed

File	Status	Preview URL	Details
defender-endpoint/mac-preferences.md	✅Succeeded

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[learn-build-service-prod]

Learn Build status updates of commit e0cbfd6:

✅ Validation status: passed

File	Status	Preview URL	Details
defender-endpoint/mac-preferences.md	✅Succeeded

For more details, please refer to the build report.

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[learn-build-service-prod]

Learn Build status updates of commit e3409e0:

✅ Validation status: passed

File	Status	Preview URL	Details
defender-endpoint/mac-preferences.md	✅Succeeded

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[denisebmsft]

Thank you @vegupta

[learn-build-service-prod]

Learn Build status updates of commit 5a35e5e:

✅ Validation status: passed

File	Status	Preview URL	Details
defender-endpoint/mac-preferences.md	✅Succeeded

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