(docs) Add missing links to factsets.markdown
(docs) Add missing links to factsets.markdown

There were a couple of missing references to the links in factsets doc, causing the
HTML translation to look weird, and the links to be unlinked basically.
rbrw/puppetdb,waynr/puppetdb,kbarber/puppetdb,kbarber/puppetdb,puppetlabs/puppetdb,waynr/puppetdb,puppetlabs/puppetdb,senior/puppetdb,puppetlabs/puppetdb,mullr/puppetdb,rbrw/puppetdb,senior/puppetdb,waynr/puppetdb,mullr/puppetdb,puppetlabs/puppetdb,kbarber/puppetdb,rbrw/puppetdb,waynr/puppetdb,rbrw/puppetdb,mullr/puppetdb,senior/puppetdb,senior/puppetdb,kbarber/puppetdb,puppetlabs/puppetdb,mullr/puppetdb,rbrw/puppetdb,mullr/puppetdb