Maps in .NET 8 #1305
Description
The Map control was introduced in .NET 7 and can be used with <Map ... />. However, the Maps doc tends to declare an xmlns to use Map: <maps:Map ... />.
This has turned out to be wise because of collisions between Maps and Shapes.
However, in .NET 8 only <maps:Map ... /> will be an option. Sweep the Maps doc to ensure only this form is used, and add a note about the change too.
The following types now need to be qualified with the new namespace schema: Map, MapSpan, Distance.