Moves the ray and spark examples from the DistributedMLForecast API reference to the "Quick start (distributed)" guide.
Also fixes the README links to point to the full website URL instead of a relative one.
Checklist:
[x] This PR has a meaningful title and a clear description.
Description
Moves the ray and spark examples from the DistributedMLForecast API reference to the "Quick start (distributed)" guide. Also fixes the README links to point to the full website URL instead of a relative one.
Checklist: