Added missing Flags Property to SMS_BoundaryGroup

[TheToor]

Added the missing Flags Property to the SMS_BoundaryGroup class. Also explained the Flags as far as I could discover them.

[prmerger-automator[bot]]

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[learn-build-service-prod[bot]]

Learn Build status updates of commit 496f298:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
memdocs/configmgr/develop/reference/core/servers/configure/sms_boundarygroup-server-wmi-class.md	:white_check_mark:Succeeded

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[Banreet]

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