Update Get-UnifiedGroup.md

[paisvivekanand]

Added description for the new added parameters to the Get-UnifiedGroup cmdlet

[learn-build-service-prod]

Learn Build status updates of commit 05280c7:

✅ Validation status: passed

File	Status	Preview URL	Details
exchange/exchange-ps/exchange/Get-UnifiedGroup.md	✅Succeeded	View (exchange-ps)

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[learn-build-service-prod]

Learn Build status updates of commit 12771c8:

✅ Validation status: passed

File	Status	Preview URL	Details
exchange/exchange-ps/exchange/Get-UnifiedGroup.md	✅Succeeded	View (exchange-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

[learn-build-service-prod]

Learn Build status updates of commit 2d7c907:

✅ Validation status: passed

File	Status	Preview URL	Details
exchange/exchange-ps/exchange/Get-UnifiedGroup.md	✅Succeeded	View (exchange-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