Fixes #1333 - Add about topic to ActiveDirectory

[sdwheeler]

Add about topic to ActiveDirectory

• Fixes AB#275611
• Fixes about_ActiveDirectory_Filter missing #1333

[officedocspr2]

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[learn-build-service-prod]

Learn Build status updates of commit c751618:

✅ Validation status: passed

File	Status	Preview URL	Details
docset/docfx.json	✅Succeeded
docset/winserver2012-ps/activedirectory/About/about_ActiveDirectory_Filter.md	✅Succeeded	View (winserver2012-ps)
docset/winserver2012-ps/activedirectory/About/About.md	✅Succeeded	View (winserver2012-ps)
docset/winserver2012r2-ps/activedirectory/About/about_ActiveDirectory_Filter.md	✅Succeeded	View (winserver2012r2-ps)
docset/winserver2012r2-ps/activedirectory/About/About.md	✅Succeeded	View (winserver2012r2-ps)
docset/winserver2016-ps/activedirectory/About/about_ActiveDirectory_Filter.md	✅Succeeded	View (WindowsServer2016-ps)
docset/winserver2016-ps/activedirectory/About/About.md	✅Succeeded	View (WindowsServer2016-ps)
docset/winserver2019-ps/activedirectory/About/about_ActiveDirectory_Filter.md	✅Succeeded	View (WindowsServer2019-ps)
docset/winserver2019-ps/activedirectory/About/About.md	✅Succeeded	View (WindowsServer2019-ps)
docset/winserver2022-ps/activedirectory/About/about_ActiveDirectory_Filter.md	✅Succeeded	View (WindowsServer2022-ps)
docset/winserver2022-ps/activedirectory/About/About.md	✅Succeeded	View (WindowsServer2022-ps)
docset/winserver2025-ps/activedirectory/About/about_ActiveDirectory_Filter.md	✅Succeeded	View (WindowsServer2025-ps)
docset/winserver2025-ps/activedirectory/About/About.md	✅Succeeded	View (WindowsServer2025-ps)

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