Update Set-ExchangeFeature.md

[chrisda]

Confirm, WhatIf, and clarification on switch parameters.

[learn-build-service-prod]

Learn Build status updates of commit a554abf:

✅ Validation status: passed

File	Status	Preview URL	Details
exchange/exchange-ps/exchange/Set-ExchangeFeature.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 8de795f:

✅ Validation status: passed

File	Status	Preview URL	Details
exchange/exchange-ps/exchange/Set-ExchangeFeature.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