Add AuthN/AuthZ metrics to built in metrics doc

[Rick-Anderson]

See dotnet/aspnetcore#59557

dup issue in .NET docs repo: dotnet/docs#45379

Page URL

https://learn.microsoft.com/en-us/aspnet/core/log-mon/metrics/built-in?view=aspnetcore-9.0&branch=pr-en-us-35108

Content source URL

https://github.com/dotnet/AspNetCore.Docs/blob/main/aspnetcore/log-mon/metrics/built-in.md

Document ID

eb916896-e92c-9a7f-b74d-813a11be339c

Platform Id

60bee8c0-95f0-1122-0c75-99dde6fedc20

Article author

@Rick-Anderson

Metadata

• ID: eb916896-e92c-9a7f-b74d-813a11be339c
• PlatformId: 60bee8c0-95f0-1122-0c75-99dde6fedc20
• Service: aspnet-core

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Associated WorkItem - 422234