Healthscore udpates: Web API help pages with Swagger and Start NSwag

[wadepickett]

Healthscore related updates.
Contributes to #32305

Minor updates to the app sample to version 8 with updates for the following packages:

• Microsoft.EntityFrameworkCore.InMemory Version="8.0.4"
• NSwag.AspNetCore Version="14.0.7"

Also targeted the project for .NET 8 and tested it.

Minor update to: tutorials/getting-started-with-NSwag.md

• Updated ms.date
• Moved to version by include file
• Updated code links to the new version 8 sample.

Minor update to: tutorials/web-api-help-pages-using-swagger.md

• Updated ms.date

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Internal previews

📄 File	🔗 Preview link
aspnetcore/tutorials/getting-started-with-NSwag.md	Get started with NSwag and ASP.NET Core
aspnetcore/tutorials/web-api-help-pages-using-swagger.md	ASP.NET Core web API documentation with Swagger / OpenAPI

[Rick-Anderson]

@wadepickett we shouldn't be making changes to v8 doc's using Swagger. We should be working on dotnet/aspnetcore#54599

[wadepickett]

I see what you mean. Mark had asked me to hit some topics to improve the health score for this sprint such as refresh dates, so I was going down a list of topics that were relatively high traffic but had not had a refresh and ran into this one which was showing 2019. The sample, however, needed to be updated to 8.0 even though it already was using NSwag in a development environment only, which we were using as part of the swagger solution. So I was just updating both topics and the sample since it wasn't a big time commitment in between working on others. I already pretty much have this done, OK to finish?