In documentation on adding a new backend, add missing import and tweak headings (#6330)
In documentation on adding a new backend, add missing import and tweak headings (#6330)


markelg/xray,pydata/xarray,pydata/xarray,pydata/xarray,markelg/xray,jhamman/xarray,jhamman/xarray,jhamman/xarray,markelg/xray