[Feature Request] Document how to EnablePiiLogging Azure dotnet-isolated Function App

[Mike Finch]

Is your feature request related to a problem? Please describe.
I'm unable to debug Access Failures for Azure Functions

Describe the solution you'd like
https://github.com/AzureAD/microsoft-identity-web/wiki/Logging#logging-personal-identifiable-information-pii
This link documents for appsettings.json, but equivalent parameters are not found for host.json

Describe alternatives you've considered
Tried "AzureFunctionsJobHost__AzureAd__EnablePiiLogging": true in environment variables with no sucess.

Additional context
Add any other context or screenshots about the feature request here.