Reorder split names

Reorder split names in the YAML metadata to be aligned with the order in the loading script.
See: https://github.com/huggingface/datasets/issues/5258

README.md

@@ -39,15 +39,15 @@ dataset_info:
   - name: answer_texts
     sequence: string
   splits:
-  - name: test
-    num_bytes: 1175656
-    num_examples: 2240
   - name: train
     num_bytes: 3589880
     num_examples: 6720
   - name: validation
     num_bytes: 1241778
     num_examples: 2240
+  - name: test
+    num_bytes: 1175656
+    num_examples: 2240
   download_size: 3276017
   dataset_size: 6007314
 ---