🚜 Use field in dataclasses

[qgallouedec]

Use fields to enhance the rendering of help.

Aligned with transformers.TrainingArguments, see here

Before:

$ python examples/datasets/hh-rlhf-helpful-base.py --help
usage: hh-rlhf-helpful-base.py [-h] [--push_to_hub [PUSH_TO_HUB]] [--repo_id REPO_ID]
                               [--dataset_num_proc DATASET_NUM_PROC]

options:
  -h, --help            show this help message and exit
  --push_to_hub [PUSH_TO_HUB]
  --repo_id REPO_ID
  --dataset_num_proc DATASET_NUM_PROC

After:

$ python examples/datasets/hh-rlhf-helpful-base.py --help
usage: hh-rlhf-helpful-base.py [-h] [--push_to_hub [PUSH_TO_HUB]] [--repo_id REPO_ID]
                               [--dataset_num_proc DATASET_NUM_PROC]

options:
  -h, --help            show this help message and exit
  --push_to_hub [PUSH_TO_HUB]
                        Whether to push the dataset to the Hugging Face Hub. (default: False)
  --repo_id REPO_ID     Hugging Face repository ID to push the dataset to. (default: trl-lib/hh-rlhf-helpful-base)
  --dataset_num_proc DATASET_NUM_PROC
                        Number of workers to use for dataset processing. (default: None)

Other minor changes:

1. Whether or not -> Whether

2. Although equivalent, the later is clearer:

   - my_args (`Optional[int]`, *optional*, defaults to `None`):
   + my_args (`int` or `None`, *optional*, defaults to `None`):

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.