Well, .dataset anyway from the outcome of #9458

Hey I've always found Xarray useful, so I wanted to start understanding the internal codebase more. Happy to take this on if no one else is tackling it?

That would be great @adam2392 ! The implementation of the property and setter that needs documenting is here

The fact you can assign to this property should probably be documented

1. In the docstring of the property
2. here https://docs.xarray.dev/en/stable/user-guide/data-structures.html#datatree-contents
3. and in a new section under here https://docs.xarray.dev/en/stable/user-guide/hierarchical-data.html#tree-contents