doc/rest-api: remove unused fields
doc/rest-api: remove unused fields

Signed-off-by: Christian Brauner <48455ab3070520a2d174545c7239d6d0fabd9a83@canonical.com>

lxc/lxd,akshaykarle/lxd,lxc/lxd,jsavikko/lxd,akshaykarle/lxd,lxc/lxd,techtonik/lxd,ollie314/lxd,georghopp/lxd,hallyn/lxd,Skarlso/lxd,Skarlso/lxd,jsavikko/lxd,georghopp/lxd,lxc/lxd,ollie314/lxd,atxwebs/lxd,pcdummy/lxd,stgraber/lxd,techtonik/lxd,stgraber/lxd,pcdummy/lxd,stgraber/lxd,stgraber/lxd,mjeanson/lxd,mjeanson/lxd,akshaykarle/lxd,hallyn/lxd,chrisglass/lxd,pcdummy/lxd,mjeanson/lxd,chrisglass/lxd,Skarlso/lxd,hallyn/lxd,lxc/lxd,stgraber/lxd,stgraber/lxd,hallyn/lxd,jsavikko/lxd,Skarlso/lxd,lxc/lxd,erikmack/lxd,atxwebs/lxd,atxwebs/lxd,hallyn/lxd,stgraber/lxd,erikmack/lxd,techtonik/lxd,ollie314/lxd,georghopp/lxd,atxwebs/lxd,hallyn/lxd,erikmack/lxd,lxc/lxd,chrisglass/lxd