These are static copies of most of the scrumwiki help pages as they existed when the site went offline.
They are here in case you would like to copy them. Consider them un-supported.
fwiw, I would encourage you to find a different tool - ScrumWiki hasn't changed in years and isn't supported or developed here. It's still on my backlog, but frankly so far down my priority list these days you should probably assume I won't be doing much on it any year soon.
If it was my money, today, I'd be looking for a Scrum plugin to MediaWiki. I've no idea if such a thing exists.
You are of course encouraged to take the code, hack on it yourself and share those improvements back with the community. If you have a big pot of gold and want to share it in return for some hacking on the project, get in touch ;) The mailing list would be the place to go.