Update files from the datasets library (from 1.6.1)

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

web_nlg.py

@@ -247,7 +247,7 @@ class WebNlg(datasets.GeneratorBasedBuilder):
         ]
 
     def _generate_examples(self, filedirs):
-        """ Yields examples. """
+        """Yields examples."""
 
         id_ = 0
         for xml_location in filedirs: