DOC: gitignore: minor update
DOC: gitignore: minor update

Former-commit-id: 12570e5e74183091a5b72cb3fc0ead533a5e068d [formerly 7030dcc0748b3f973a5ce7331ca4d032b02032bb]
Former-commit-id: 4c74db65b575e08f0a3b4a07e3eed3cb4b5f48bf
Former-commit-id: c0d3a664361dcd76e26b9f7322ba32f5464b062f
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox