Clarify nuget/mono isn't supported and never was on Unixy platforms.

[JonDouglas]

No description provided.

[learn-build-service-prod]

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[zivkan]

There are 35 files in this docs repo that mention mono. This is a good first step, but I think we need to change wording on other pages too, for example, the page on installing/obtaining nuget. For better or worse, about half the mono search results look to be release notes, and I don't think we need to make any changes there, so I think the effort required is smaller than the 35 files with results makes it sound to be.

[JonDouglas]

There are 35 files in this docs repo that mention mono. This is a good first step, but I think we need to change wording on other pages too, for example, the page on installing/obtaining nuget. For better or worse, about half the mono search results look to be release notes, and I don't think we need to make any changes there, so I think the effort required is smaller than the 35 files with results makes it sound to be.

I agree that there are no changes really needed to be made. Older mono versions will still exist and be relevant. We can add notes later

[learn-build-service-prod]

Learn Build status updates of commit ed18cd2:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/resources/NuGet-FAQ.yml	✅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