Update remarks for Enviroment.OSVersion

[jkotas]

Enviroment.OSVersion does not return the actual OS version in some compatibility modes.

Fixes dotnet/runtime#85758

[gewarren]

"More" seems a little vague to me. How about "most" or "most but not all"?

[learn-build-service-prod]

Learn Build status updates of commit 8eccded:

✅ Validation status: passed

File	Status	Preview URL	Details
xml/System/Environment.xml	✅Succeeded	View

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[learn-build-service-prod]

Learn Build status updates of commit 8d1b750:

✅ Validation status: passed

File	Status	Preview URL	Details
xml/System/Environment.xml	✅Succeeded	View

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 033e824:

✅ Validation status: passed

File	Status	Preview URL	Details
xml/System/Environment.xml	✅Succeeded	View

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