DOC: Added parameter list to open_dataarray (#1758)
DOC: Added parameter list to open_dataarray (#1758)

* Added parameter list to open_dataarray

* Added inputs to open_dataset at L400

* Changed input to open_dataset on L400

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