issue_comments: 969329589

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https://github.com/pydata/xarray/issues/2410#issuecomment-969329589 https://api.github.com/repos/pydata/xarray/issues/2410 969329589 IC_kwDOAMm_X845xsu1 20617032 2021-11-15T21:17:14Z 2021-11-15T21:17:14Z NONE

It appears there is an incorrect statement in the 'indexing' section of the terminology page.

By construction, len(arr.dims) == len(arr.indexes)

But this simple code does not reproduce this result

``` da = xr.DataArray(np.random.randn(2, 3), dims=("x", "y"), coords={"x": [10, 20]})

len(da.dims) == len(da.indexes)

False ```

Because the dimension y does not have any coordinates associated with it. Maybe I am missing something, but it seems a clarification should be added that this is only true for dimensions with coordinates assigned to them. 

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