index.html: Fixed code formatting for table header
index.html: Fixed code formatting for table header

Former-commit-id: 727f1212373cf210e13dbadbed7879ae4386d87f
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox