Update usage.

README.md

@@ -58,22 +58,12 @@ ECMWF data products are subject to the following terms:
 Use the Huggingface Hub file system to load files. The `datasets` library doesn't support netCDF files yet.
 
 ```python
-from huggingface_hub import HfFileSystem
+from huggingface_hub import HfFileSystem, hf_hub_download
 import xarray
 
 fs = HfFileSystem()
 
 files = fs.ls("datasets/shermansiu/dm_graphcast_datasets/dataset", detail=False)
-
-with fs.open(files[0], "rb") as f:
-    example_batch = xarray.load_dataset(f).compute()
-```
-
-Alternatively, if you want a local copy, you can run this (downloaded files will not be re-downloaded unless instructed to otherwise):
-
-```python
-from huggingface_hub import hf_hub_download
-
 local_file: str = hf_hub_download(repo_id="shermansiu/dm_graphcast_datasets", filename=f"dataset/{files[0]}", repo_type="dataset")
 
 with open(local_file, "rb") as f: