REF: added \n to the doc (more clear)
REF: added \n to the doc (more clear)

Former-commit-id: ed511bfe12659208cdff69abf74aca11f9004918
Former-commit-id: e6967719e05df31c86e218b1a694fbc5237c79e6
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox