Minor documentation formatting fix
Minor documentation formatting fix

Wrap lines to 72 characters when possible like rest of docs.

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