issues: 471409673

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471409673 MDU6SXNzdWU0NzE0MDk2NzM= 3158 Out of date docstring for concat_dim in open_mfdataset 17169544 open 0     3 2019-07-23T00:01:05Z 2021-07-08T17:40:45Z   CONTRIBUTOR      

In the open_mfdataset docstring:

concat_dim : str, or list of str, DataArray, Index or None, optional Dimensions to concatenate files along. You only need to provide this argument if any of the dimensions along which you want to concatenate is not a dimension in the original datasets, e.g., if you want to stack a collection of 2D arrays along a third dimension. ...

This is true for the default combine='_old_auto', but when using combine='nested' it is required while it is not used by combine='by_coords'. It would be clearer to make that distinction here.

 
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