Update docs for general element handling.
Update docs for general element handling.

Dataset elements are no longer limited to nested structures of Tensors. This change updates the docs to refer to "dataset elements" instead of nested structures of Tensors.

We may want to also deprecate from_tensors/from_tensor_slices and replace them with better-named from_element/from_element_slices. Since this is more controversial, we can do it as a separate change.

PiperOrigin-RevId: 258375042

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