Fix typo in grouped arithmetic example
Fix typo in grouped arithmetic example
jhamman/xray,hetland/xray,petercable/xray,jhamman/xarray,pydata/xarray,clarkfitzg/xray,shoyer/xarray,kjordahl/xray,drewokane/xray,rabernat/xray,shoyer/xray,markelg/xray,pydata/xarray,jhamman/xarray,hetland/xray,cpaulik/xray,chunweiyuan/xarray,kjordahl/xray,xray/xray,markelg/xray,cpaulik/xray,rabernat/xray,pydata/xarray,jhamman/xarray,markelg/xray,clarkfitzg/xray,shoyer/xarray,jcmgray/xarray,NicWayand/xray