DOC: updated batch_processing (incomplete)
DOC: updated batch_processing (incomplete)

Former-commit-id: 7ca9f66fd144e1b0769a4209c47fd5aa263c1558 [formerly 91bff33e11d087fd7693ef6502b4760f0f5bf7be]
Former-commit-id: 4967f7a3221dad8ff6be5c31b9cbab96381123db
Former-commit-id: bc84d865661ca82475c4d6863133a16b4b125315
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox