Update files from the datasets library (from 1.6.1)

Release notes: https://github.com/huggingface/datasets/releases/tag/1.6.1

head_qa.py

@@ -117,7 +117,7 @@ class HeadQA(datasets.GeneratorBasedBuilder):
         ]
 
     def _generate_examples(self, filepath):
-        """ Yields examples. """
+        """Yields examples."""
         with open(filepath, encoding="utf-8") as f:
             head_qa = json.load(f)
             for exam in head_qa["exams"]: