Improve explanation of MasterDetailLayout #4441
Description
The functionality of the MDL component is still a bit unclear to many users.
The documentation could help explain it by way of mental models:
- When the MDL is used as a parent router layout, think of the detail area as a separate view that would otherwise be normally navigated to (away from the master view)
- When the MDL is used without routing, think of it as a normal layout, like HL or VL, in which you add/remove the detail area to show/hide it.
Additionally, in the samples provided, the detail area should be visible by default. Users are currently confused when they just resize the splitter but don't see anything happening, because the detail area has not been opened by selecting an item in the Grid.
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