DOC: register_to_template: improved documentation (#1262) (#1287)
DOC: register_to_template: improved documentation (#1262) (#1287)



Former-commit-id: d0ae05006f159218e951c1d582e61e614efe1876
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox