These docs are... very bad...unhelpful. Almost don't ask level annoying but for the record [after wasting far too much time on this needless confusion]:
Links do not match their titles in the RHS e.g. 'trusty' will not point to that distro version
Allegedly updated but the version numbers don't extend to a mid-2015 range so clearly needs someone who understands this to go in and relink up the relevant pages.
😑 Even the links that are there don't have pages associated with them (unlike Wikipedia they appear indistinguishable from 'live' links)
There is no 'more info' button and the 'system report' does not show this 'model number' (as far as I can see) so run sysctl hw.model