[DOC] Be more explicit about netCDF groups and xarray.Dataset relationship. #3113
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This PR is related to the discussion in #2916. In https://xarray.pydata.org/en/stable/io.html#netcdf there are statements like
This is useful conceptually but can be confusing when working with netCDF groups which are not supported as part of the data model. I thought it would be clearer if the description of how to work with groups explicitly said this.