DOC: small adjustments
DOC: small adjustments

Former-commit-id: 63f67796adc6ce7cd1cf6628ecabf325491b26c7 [formerly f1a0341ac76f791046202b4c203503878e341521]
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Former-commit-id: 2ba4d5ef137a62c488adfa691b2685a9acd1767a
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox