Update files from the datasets library (from 1.6.1)

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

polemo2.py

@@ -120,7 +120,7 @@ class Polemo2(datasets.GeneratorBasedBuilder):
         ]
 
     def _generate_examples(self, filepath, split):
-        """ Yields examples. """
+        """Yields examples."""
         with open(filepath, encoding="utf-8") as f:
             reader = csv.DictReader(f, delimiter="\t", quoting=csv.QUOTE_NONE)
             for id_, row in enumerate(reader):