fix split name validation->valid

WikiHowNFQA.py

@@ -1,5 +1,6 @@
 from datasets import DatasetInfo, SplitGenerator, ClassLabel, Sequence, Split, GeneratorBasedBuilder
 from datasets.features import Features, Value
+
 import json
 
 
@@ -12,7 +13,7 @@ class WikiHowNFQADataset(GeneratorBasedBuilder):
             'question': Value('string'),
             'answer': Value('string'),
             'related_document_urls_wayback_snapshots': Sequence(Value('string')),
-            'split': ClassLabel(names=['train', 'validation', 'test']),
+            'split': ClassLabel(names=['train', 'valid', 'test']),
             'cluster': Value('int32'),
         })