fix docstring

composer/checkpoint/save.py

@@ -30,11 +30,10 @@ def save_state_dict_to_disk(
 
     Args:
         state_dict (Dict[str,Any]): The state dict to save.
-        destination_dir (str): The directory to save the state dict to.
-        filename (str): The name of the file to save the state dict to.
+        destination_file_path (str): The path to save the state dict to. If sharded,
+          this should be the pth to a directory. Otherwise, it should be a path to a file.
         overwrite (bool): If True, the file will be overwritten if it exists.
         save_format (str): The format to save the state dict in. One of 'pt', 'hf', or 'safetensor'.
-        async_save (bool): If True, the save will be done asynchronously and the function will return with the path of where it was going to be saved
 
     Returns:
         str: The full path to the saved state dict if (sharded is false and rank 0) or if sharded is true, otherwise None.