Help users detangle #start, #end and #event trigger channels and their
respective offsets. I was struggling with this and it took reading
https://community.openhab.org/t/solved-open-rollershutters-based-on-astro-binding-with-offset-does-not-work/123336
to figure out where I went wrong.
While here, maybe fix the Markdown rendering of QuantityType<Intensity>