DOC: fixed small mistake
DOC: fixed small mistake

Former-commit-id: 2b8cb5eb2deebd1d850180a4f0d1d2d6343df70a [formerly 434d9b4d88d97cf95df7b6e09ba373dfdc6a78cf]
Former-commit-id: e13bfc98d6fe2f85e24e070ab8f6a1c29158f324
Former-commit-id: 58fc0ed87251c4b65ea62e4d3b1ce359c3d47af7
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox