Document YAML configuration with "data_dir"
COLLABORATOR
In particular, I would like to have an example of how to replace the following configuration (from https://huggingface.co/docs/hub/datasets-manual-configuration#splits)

```
---
configs:
- config_name: default
  data_files:
  - split: train
    path: "data/*.csv"
  - split: test
    path: "holdout/*.csv"
---
```

with the `data_dir` field.
2024-01-05T14:06:16Z
https://github.com/huggingface/datasets/issues/6561#issuecomment-1878731674
https://api.github.com/repos/huggingface/datasets/issues/6561
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2024-01-05T14:06:16Z
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See https://huggingface.co/datasets/uonlp/CulturaX/discussions/15#6597e83f185db94370d6bf50 for reference