Logging output of the LogWithCustomEventName example fails to demonstrate the feature

Under [Additional logging examples](https://docs.microsoft.com/en-us/dotnet/core/extensions/logger-message-generator#additional-logging-examples) there is a code example where a logger message with a custom `EventName` is defined (the method name in the example code is `LogWithCustomEventName`, it is the second method declared). The example logging outputs below that both fail to demonstrate the result of setting `EventName` (the log message that should demonstrate it is the first log message in both outputs).

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* ID: 6fc4ecf0-19e4-54d3-c34e-b6eadb80262b
* Version Independent ID: decc74aa-a2d5-8727-f22b-3862bacde737
* Content: [Compile-time logging source generation](https://docs.microsoft.com/en-us/dotnet/core/extensions/logger-message-generator)
* Content Source: [docs/core/extensions/logger-message-generator.md](https://github.com/dotnet/docs/blob/main/docs/core/extensions/logger-message-generator.md)
* Product: **dotnet-fundamentals**
* GitHub Login: @maryamariyan
* Microsoft Alias: **maariyan**