Update datamodel.rst (#331)
Update datamodel.rst (#331)

[merge] Updating voxelres defnition
neurodata/ndstore,openconnectome/open-connectome,neurodata/ndstore,openconnectome/open-connectome,openconnectome/open-connectome,openconnectome/open-connectome,neurodata/ndstore,openconnectome/open-connectome,neurodata/ndstore,openconnectome/open-connectome