Update Set-MpPreference.md

[rafalfitt]

fixed obvious crap

PAC = Proxy Auto-Configuration
it can be hosted on a web server

please see https://learn.microsoft.com/en-us/defender-endpoint/configure-proxy-internet?view=o365-worldwide

PR Summary

I fixed an obvious error in documentation - PAC is a proxy auto-config file (.pac)

[learn-build-service-prod]

Learn Build status updates of commit f00118f:

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[learn-build-service-prod]

Learn Build status updates of commit 1c4cb93:

✅ Validation status: passed

File	Status	Preview URL	Details
docset/winserver2022-ps/defender/Set-MpPreference.md	✅Succeeded	View (WindowsServer2022-ps)

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[denisebmsft]

Thank you so much, @rafalfitt

[learn-build-service-prod]

Learn Build status updates of commit 9b209d3:

✅ Validation status: passed

File	Status	Preview URL	Details
docset/winserver2022-ps/defender/Set-MpPreference.md	✅Succeeded	View (WindowsServer2022-ps)

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