REF: Add info on how to compute the model
REF: Add info on how to compute the model

Former-commit-id: ec2c00bac5d84d0d848eebf25935087352cc9a3e [formerly b321e8b32abf0e816e4d339a12784380d149d38c]
Former-commit-id: acaedf40254022cb7bd53898223fdd99b6598ecc
Former-commit-id: 476cb8314ef265c0959a96daaa75e3cd72a512af
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox