Update fastai.md

Author: vtjl10

docs/hub/fastai.md

@@ -14,7 +14,7 @@ All models on the Hub come up with the following features:
 
 ## Using existing models
 
-The `huggingface_hub` library is a lightweight Python client with utlity functions to download models from the Hub.
+The `huggingface_hub` library is a lightweight Python client with utility functions to download models from the Hub.
 
 ```bash
 pip install huggingface_hub["fastai"]