React Routes Switch in Ionic can not route to an IonPage

### URL

https://ionicframework.com/docs/react/navigation#switches-in-ionrouteroutlet

### Issue Description

The `Switch` component can not route to a sub component that is wrapped in `IonPage`.

This is what I think is the reason.
Because `IonPage` is exclusive, there can only be a single `IonPage` in a view. The `Switch` can not route to a component with `IonPage`. As shown by the React Router documentation "basic" example, a custom page component can implement a list of links that uses a `Switch` to route a subview of components below it within the same view. This would result in nested `IonPage` components, and therefore doesn't work.

The `Switch` component is useful only in the case where you want to insert components into a subview that will update the URL and work with the history stack, but in a way that is not tabs.

Start with the React navigation documentation at the URL in the issue, especially the section on switches in IonRouterOutlet. Determine whether the example or its explanation should address routing to components wrapped in IonPage; done means the documentation accurately explains the supported behavior and limitation.

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