Update using-dotnet-cli.md

[AustinWise]

Fixes "error NU1102: Unable to find package Microsoft.WindowsDesktop.App.Runtime.win-x64 with version (= 5.0.0-dev)"

This is based on dotnet/sdk#10393 (comment) .

[Dotnet-GitSync-Bot]

I couldn't figure out the best area label to add to this PR. If you have write-permissions please help me learn by adding exactly one area label.

[AustinWise]

This is a followup to #40504 that fixes the build issue I mentioned in that ticket. When using dotnet publish with an ASP.NET website, the published binaries will be a mix of ASP.NET binaries from the SDK and the dotnet/runtime binaries. An alternate approach to fix the build issue is to remove the SDK's knowledge of ASP.NET and Windows Desktop:

  <ItemGroup>
    <KnownFrameworkReference Remove="Microsoft.AspNetCore.App" />
    <KnownFrameworkReference Remove="Microsoft.WindowsDesktop.App" />
  </ItemGroup>

This allows console apps to build but prevents you from building ASP.NET applications. I'm not sure which approach would be better to document: the one that gives you more flexibility but allows you to mix ASP.NET and dotnet/runtime versions (which could break in strange ways) or the more strict and internally consistent way. This PR chooses the flexible but potentially dangerous approach.