Fix TypeError when loading some subsets

Fix `TypeError: _generate_examples() got an unexpected keyword argument 'tfrecord'`.
This affects subsets with the `quail_` prefix, e.g. `quail_description_context_question_text`

P3.py

@@ -160,7 +160,7 @@ class P3(datasets.GeneratorBasedBuilder):
                 datasets.SplitGenerator(
                     name=datasets.Split(special_split_name),
                     gen_kwargs={
-                        "tfrecord": data_dir[special_split_name],
+                        "tfrecord_files": data_dir[special_split_name],
                     },
                 )
             )