.NET 9: Add Problem and ValidationProblem result types support construction with IEnumerable

[Rick-Anderson]

Description

Add a section to What's new covering Problem and ValidationProblem result types support construction with IEnumerable<KeyValuePair<string, object?>> values

Related #33309

Page URL

https://learn.microsoft.com/en-us/aspnet/core/fundamentals/openapi/aspnetcore-openapi?view=aspnetcore-9.0&tabs=visual-studio%2Cminimal-apis

Content source URL

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

Document ID

27bad30c-e0b4-10fb-b202-a29d4f8fad24

Article author

@captainsafia

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Associated WorkItem - 296818