add missing doc

Author: Felipe Mello

torchtune/datasets/_text_completion.py

@@ -33,8 +33,9 @@ class TextCompletionDataset(Dataset):
         filter_fn (Optional[Callable]): callable used to filter the dataset prior to any pre-processing. See
             the Hugging Face `docs <https://huggingface.co/docs/datasets/v2.20.0/process#select-and-filter>`_ for more
             details.
-        **load_dataset_kwargs (Dict[str, Any]): additional keyword arguments to pass to ``load_dataset``,
-            such as ``data_files`` or ``split``.
+        **load_dataset_kwargs (Dict[str, Any]): additional keyword arguments to pass to ``load_dataset``. See Hugging
+            Face's `API ref <https://huggingface.co/docs/datasets/en/package_reference/loading_methods#datasets.load_dataset>`_
+            for more details.
     """
 
     def __init__(