Update feature availablity doc

[nkolev92]

Bringing this doc up to date.

dotnet package search, dotnet nuget sources and dotnet nuget config now exist.

[learn-build-service-prod]

Learn Build status updates of commit d6713d3:

💡 Validation status: suggestions

File	Status	Preview URL	Details
docs/install-nuget-client-tools.md	💡Suggestion	View	Details

docs/install-nuget-client-tools.md

• Line 43, Column 62: [Suggestion: docs-link-absolute - See documentation] Absolute link 'https://learn.microsoft.com/visualstudio/productinfo/vs-servicing' will be broken in isolated environments. Replace with a relative link.

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