id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,active_lock_reason,draft,pull_request,body,reactions,performed_via_github_app,state_reason,repo,type
1532822084,PR_kwDOAMm_X85HW5C_,7438,Refer to open_zarr in open_dataset docstring,26591824,closed,0,,,1,2023-01-13T19:47:21Z,2023-01-13T21:10:08Z,2023-01-13T20:50:32Z,CONTRIBUTOR,,0,pydata/xarray/pulls/7438,"<!-- Feel free to remove check-list items aren't relevant to your change -->

This adds a sentence (below) under ""chunks"" in doctoring of `open_dataset()` to clarify current usage for those who want the same behavior as `open_zarr()` used to provide:

```
In order to reproduce the default behavior of xr.open_zarr(...) use `xr.open_dataset(..., engine='zarr', chunks={})`.
```

- [x] Closes #7293
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