I did this, sort of, but had an interesting problem. Once i'd rewritten the onboarding documentation (because it was given to me as four or five different PDFs, which really isn't that useful, and doesn't tell you what you specifically will need to have set up), there was no place to put it; there were 3 wikis, none of which anyone really looked at other than for their own stuff. New hires wouldn't know where to look to find these onboarding docs and nobody else would know either.

So it just floated around and new hires basically started with the PDF all over again.