.NET 9, build time OpenAPI Edit doc, test all code

[Rick-Anderson]

Description

Page URL

https://learn.microsoft.com/en-us/aspnet/core/fundamentals/openapi/buildtime-openapi?view=aspnetcore-8.0&branch=pr-en-us-33359&tabs=visual-studio

Content source URL

https://github.com/dotnet/AspNetCore.Docs/blob/main/aspnetcore/fundamentals/openapi/buildtime-openapi.md

Document ID

97a2b16c-8dac-beb5-54ae-b10f4813325b

Article author

@captainsafia

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Associated WorkItem - 297893