[MINOR:TYPO] Update datasets-adding.md (#1411)

huggingface-hub -> huggingface_hub

Author: cakiki

docs/hub/datasets-adding.md

@@ -109,6 +109,6 @@ After uploading your dataset, make sure the Dataset Viewer correctly shows your
 
 The Hugging Face Hub supports large scale datasets, usually uploaded in Parquet (e.g. via `push_to_hub()` using [🤗 Datasets](/docs/datasets/main/en/package_reference/main_classes#datasets.Dataset.push_to_hub)) or [WebDataset](https://github.com/webdataset/webdataset) format.
 
-You can upload large scale datasets at high speed using the `huggingface-hub` library.
+You can upload large scale datasets at high speed using the `huggingface_hub` library.
 
 See [how to upload a folder by chunks](/docs/huggingface_hub/guides/upload#upload-a-folder-by-chunks), the [tips and tricks for large uploads](/docs/huggingface_hub/guides/upload#tips-and-tricks-for-large-uploads) and the [repository limitations and recommendations](./repositories-recommendations).