Fix some outdated links in doc comments
Fix some outdated links in doc comments

salzhrani/prosemirror,mattberkowitz/prosemirror,tgecho/prosemirror,adrianheine/prosemirror,bengler/prosemirror,tzuhsiulin/prosemirror,adrianheine/prosemirror,mattberkowitz/prosemirror,adrianheine/prosemirror,salzhrani/prosemirror,kiejo/prosemirror,kiejo/prosemirror,salzhrani/prosemirror,kiejo/prosemirror,tgecho/prosemirror,jacwright/prosemirror,tzuhsiulin/prosemirror,bengler/prosemirror,tzuhsiulin/prosemirror,jacwright/prosemirror