Add more detail on why (context.User.Id) is not getting evaluated from Azure management portal under Transformation policies

[anu-01]

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[asofio]

Along with a clearer explanation, would it be helpful to change the code to what is shown below so that this does not cause a failure?

<value>@(context.User == null ? "Unknown" : context.User.Id)</value>

[simonkurtz-MSFT]

This was removed from the lab as it was problematic and seemingly did not illustrate the value of transformation policies any more than what we already have in place.