DOC: removed old usage
DOC: removed old usage

Former-commit-id: 0c4a0659312d13539775af041629299fc6949620
Former-commit-id: c7763ce40e8e53464fdf0a11e53cddf413c21c16
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox