add /dev/net/tun and /dev/fuse to docs
add /dev/net/tun and /dev/fuse to docs

we supply these devices now, so let's document it

Signed-off-by: Tycho Andersen <10c18fcb898ee6b17d6575d444b125d10b3f4d6a@canonical.com>

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