added model cube and in to documentation reference
added model cube and in to documentation reference

bretthandrews/marvin,albireox/marvin,bretthandrews/marvin,albireox/marvin,sdss/marvin,bretthandrews/marvin,albireox/marvin,bretthandrews/marvin,albireox/marvin,sdss/marvin,sdss/marvin,sdss/marvin