* Just updated sxs link per issue 10559
* Updates for side by side and web root references
* updated per tdykstra recommendations, link changes
* changes xref to relative link for web root
Fixes#10559
* Updated Mac vs screenshots & start-stop instruction
* Fixed reverted line of text for stop + start app.
* Update to core vs 4.x topic plus its include.
* Update aspnetcore/fundamentals/choose-aspnet-framework.md
Thanks Tom.
Co-Authored-By: Tom Dykstra <tdykstra@microsoft.com>