doc: hardware: tails-3.0 is out and only supports x86_64
doc: hardware: tails-3.0 is out and only supports x86_64

ehartsuyker/securedrop,garrettr/securedrop,ehartsuyker/securedrop,heartsucker/securedrop,micahflee/securedrop,conorsch/securedrop,garrettr/securedrop,conorsch/securedrop,ehartsuyker/securedrop,ehartsuyker/securedrop,ehartsuyker/securedrop,ehartsuyker/securedrop,garrettr/securedrop,conorsch/securedrop,micahflee/securedrop,garrettr/securedrop,micahflee/securedrop,ageis/securedrop,micahflee/securedrop,conorsch/securedrop,heartsucker/securedrop,conorsch/securedrop,ageis/securedrop,heartsucker/securedrop,heartsucker/securedrop,ageis/securedrop,heartsucker/securedrop,ageis/securedrop