FlyoutPage.IsPresented behaves different to Xamarin 5

### Description

The [documentation](https://docs.microsoft.com/en-us/dotnet/maui/user-interface/pages/flyoutpage) shows that `IsPresented` must be set to `false` so that the flyout closes on phones:

```xml
void OnSelectionChanged(object sender, SelectionChangedEventArgs e)
{
var item = e.CurrentSelection.FirstOrDefault() as FlyoutPageItem;
if (item != null)
{
Detail = new NavigationPage((Page)Activator.CreateInstance(item.TargetType));
IsPresented = false;
}
}
```

But this code throws an exception on the Windows platform:
https://github.com/dotnet/maui/blob/65104a2163505138e3b9f2cc798a2e9c4f577566/src/Controls/src/Core/FlyoutPage.cs#L286-L289

Please, update the documentation. See workaround.

**Xamarin**: The behavior changed since Xamarin 5. In Xamarin I have used:
https://github.com/jbe2277/waf/blob/acbf97f70736203b47e5e99d399d691d6121fb0f/src/NewsReader/NewsReader.Presentation/Views/ShellView.xaml.cs#L64

This doesn't work correct anymore. The exception is raised on the Windows platform.

Maybe related: https://github.com/dotnet/maui/issues/9801

### Steps to Reproduce

Clone this repo:
https://github.com/jbe2277/waf/tree/b42f0f1a26287dce428f3c34a2c90b4a7d2aeab7

### Link to public reproduction project repository

https://github.com/jbe2277/waf/tree/b42f0f1a26287dce428f3c34a2c90b4a7d2aeab7

### Version with bug

6.0.486 (current)

### Last version that worked well

Unknown/Other

### Affected platforms

Windows

### Affected platform versions

net6.0-windows10.0.19041.0

### Did you find any workaround?

This commit solved the issue:
https://github.com/jbe2277/waf/commit/69803cef490970a344c370616021464f59ae201d

The important part is:
```C#
if (!((IFlyoutPageController)this).ShouldShowSplitMode) IsPresented = false;
```

I believe this API has some flaws:

1. It's necessary to cast `this` so that `ShouldShowSplitMode` can be accessed. However, this is a main use case and so it should be accessible directly via `FlyoutPage`.
2. The `CanChangeIsPresented` property which I used first for the check doesn't work as expected. Although the property returned `true`, setting of `IsPresented = false` resulted in the exception.

### Relevant log output

_No response_

Start with the FlyoutPage documentation linked in the issue and compare its IsPresented example with the Windows behavior described in src/Controls/src/Core/FlyoutPage.cs at lines 286-289. Review the linked workaround commit and reproduction project, then update the documentation to explain the Windows limitation and workaround; the documentation should no longer recommend code that throws the reported exception.

Written by the indexing model from the issue text.