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Improve zarr chunks docs #9140

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Makes them more structure, consistent. I think removes a mistake re the default chunks arg in open_zarr (it's not None, it's auto).

Adds a comment re performance with chunks=None, closing #9111

Makes them more structure, consistent. I think removes a mistake re the default chunks arg in `open_zarr` (it's not `None`, it's `auto`).

Adds a comment re performance with `chunks=None`, closing pydata#9111
- ``chunks=None`` skips using dask, which is generally faster for
small arrays.
- ``chunks=-1`` loads the data with dask using a single chunk for all arrays.
- ``chunks={}`` loads the data with dask using engine preferred chunks if
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perhaps add "Usually dask chunk size will be identical to the format's chunk size" or something like that?

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