Sample code is pretty terrible

Please provide samples that include comments and avoid the use of "myapp" type parameters with no explanation. Authentication with MSAL now has a pretty bewildering array of flavours - it would be swell to get sample code for a particular platform that takes you through from beginning to end without any mystery variables to figure out

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#### Document Details

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* ID: 829bc017-4a10-6ca5-0717-e1e62f59aacc
* Version Independent ID: 829bc017-4a10-6ca5-0717-e1e62f59aacc
* Content: [Web Authenticator - .NET MAUI](https://docs.microsoft.com/en-us/dotnet/maui/platform-integration/communication/authentication?tabs=ios)
* Content Source: [docs/platform-integration/communication/authentication.md](https://github.com/dotnet/docs-maui/blob/main/docs/platform-integration/communication/authentication.md)
* Product: **dotnet-mobile**
* Technology: **dotnet-maui**
* GitHub Login: @davidbritch
* Microsoft Alias: **dabritch**