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auto_combine warnings with open_mfdataset #3091

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@dcherian

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@dcherian

I'm seeing this warning when using open_mfdataset(list_of_files) on master.

/gpfs/u/home/dcherian/python/xarray/xarray/backends/api.py:783: FutureWarning: In xarray version 0.13 `auto_combine` will be deprecated.
/gpfs/u/home/dcherian/python/xarray/xarray/backends/api.py:783: FutureWarning: The datasets supplied have global dimension coordinates. You may want
to use the new `combine_by_coords` function (or the
`combine='by_coords'` option to `open_mfdataset` to order the datasets
before concatenation. Alternatively, to continue concatenating based
on the order the datasets are supplied in in future, please use the
new `combine_nested` function (or the `combine='nested'` option to
open_mfdataset).

I don't think we should be issuing this warning when using open_mfdataset with default kwargs. Also there's a typo: "in in future"

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