DOC: updated documentation of -label method
DOC: updated documentation of -label method

Former-commit-id: f27bc5690fc922ead796358ecbf4a92d6c57a28d [formerly ca6f93de9f07315cd8e02db0969e4c9e2e9d22fc]
Former-commit-id: 89b181e19abca7e38f24e2ced3bdffe2bb692e81
Former-commit-id: 49ef9f5aa7c7ffb6e4edc0d6cdbfa6b1eec9c4ff
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox