DOC: sct_launcher: minor visual details
DOC: sct_launcher: minor visual details

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Former-commit-id: feedfccd6e9c9ad3b850fecb4ae3e2508ce97eec
Former-commit-id: 1affa9ee59c5bf443f0632fcb4daf6e30b2712a9
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox