Scaffold a controller instructions foe VS Code for .Net 6.0

The Scaffold a controller instructions for VS Code for the .Net 6.0 projects is having issues as some packages were not available for .net6.0 and some 7.0 packages could be installed for the .net6.0 project.

The below tool is not available for .Net6.0

`dotnet tool install -g dotnet-aspnet-codegenerator`

The below command did not work saying no .net 6.0 versions

`dotnet add package Microsoft.VisualStudio.Web.CodeGeneration.Design`

The below two commands installed the 7.0 version packages for .net6.0 project.

`dotnet add package Microsoft.EntityFrameworkCore.Design`
`dotnet add package Microsoft.EntityFrameworkCore.SqlServer`

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#### Document Details

⚠ *Do not edit this section. It is required for learn.microsoft.com ➟ GitHub issue linking.*

* ID: 583ae3e7-5915-f22b-e54c-6c100cf2a7da
* Version Independent ID: 95f2549e-29f9-e31a-b4d0-432b971643ff
* Content: [Tutorial: Create a web API with ASP.NET Core](https://learn.microsoft.com/en-us/aspnet/core/tutorials/first-web-api?view=aspnetcore-6.0&tabs=visual-studio-code)
* Content Source: [aspnetcore/tutorials/first-web-api.md](https://github.com/dotnet/AspNetCore.Docs/blob/main/aspnetcore/tutorials/first-web-api.md)
* Product: **aspnet-core**
* Technology: **aspnetcore-tutorials**
* GitHub Login: @wadepickett
* Microsoft Alias: **wpickett**

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[Associated WorkItem - 97035](https://dev.azure.com/msft-skilling/Content/_workitems/edit/97035)