sct_pipeline_makefig minor cosmetic change (#1762)
sct_pipeline_makefig minor cosmetic change (#1762)

* minor cosmetic change

* added useful info on the fig


Former-commit-id: 83ce64e015c0df376e00aea0c94f47ddc20024a3
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox