Whenever an updated version of Xamarin Forms is released, the documentation on usage could be updated to reflect those changes. Then when a developer using Xamarin Forms looks, they can select the document related to the version they use. Currently Xamarin Forms feels fragile and any update seems to break something else, with no documentation around of much use.
Keep developers up to date with the changes and how usage has changed. Make the platform feel a little more stable. Currently using Xamarin Forms, Xarmarin Forms Maps and the Support libraries is a minefield. It doesn't need to be that way.