Warn about conf files

[Rick-Anderson]

Description

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Page URL

https://learn.microsoft.com/en-us/aspnet/core/security/app-secrets?view=aspnetcore-8.0&tabs=windows

Content source URL

https://github.com/dotnet/AspNetCore.Docs/blob/main/aspnetcore/security/app-secrets.md

Document ID

ba688ac2-e90e-fce5-f60d-40c2553c3efd

Article author

@tdykstra

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Associated WorkItem - 335248