Add another screenshot for the Monkeys

I thought this was well written, but in the section where you talk about bottom and top tab bars, after you show the screenshot with the Cats and Dogs having a top tag bar, could you also include a screenshot of the Monkeys page? That would drive home the difference between the two, i.e., that a single page does not get a top tab bar.

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#### Document Details

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* ID: 8b75579a-1ca4-376a-f5df-41de5c690acc
* Version Independent ID: 8b75579a-1ca4-376a-f5df-41de5c690acc
* Content: [.NET MAUI Shell tabs - .NET MAUI](https://learn.microsoft.com/en-us/dotnet/maui/fundamentals/shell/tabs)
* Content Source: [docs/fundamentals/shell/tabs.md](https://github.com/dotnet/docs-maui/blob/main/docs/fundamentals/shell/tabs.md)
* Product: **dotnet-mobile**
* Technology: **dotnet-maui**
* GitHub Login: @davidbritch
* Microsoft Alias: **dabritch**