fix birthyear feature misspelling

rixvox.py

@@ -75,7 +75,7 @@ class Rixvox(datasets.GeneratorBasedBuilder):
                 "speaker": datasets.Value("string"),
                 "party": datasets.Value("string"),
                 "gender": datasets.Value("string"),
-                "birthyear": datasets.Value("int64"),
+                "birth_year": datasets.Value("int64"),
                 "electoral_district": datasets.Value("string"),
                 "intressent_id": datasets.Value("string"),
                 "speaker_from_id": datasets.Value("bool"),