Updating the README.md following-up a change in the portal
Updating the README.md following-up a change in the portal

AzureADSamples/WebAPI-OnBehalfOf-DotNet,Azure-Samples/active-directory-dotnet-webapi-onbehalfof,AzureADSamples/WebAPI-OnBehalfOf-DotNet,Azure-Samples/active-directory-dotnet-webapi-onbehalfof,AzureADSamples/WebAPI-OnBehalfOf-DotNet,Azure-Samples/active-directory-dotnet-webapi-onbehalfof