DOC: remove mention errors in math without label overlap (#1318)
DOC: remove mention errors in math without label overlap (#1318)


shoyer/xarray,xray/xray,markelg/xray,chunweiyuan/xarray,jhamman/xarray,markelg/xray,jhamman/xarray,pydata/xarray,jhamman/xarray,pydata/xarray,markelg/xray,jcmgray/xarray,rabernat/xray,shoyer/xarray,shoyer/xray,rabernat/xray,jhamman/xray,pydata/xarray