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

@@ -47,15 +47,15 @@ dataset_info:
   - name: answer_text
     sequence: string
   splits:
-  - name: test
-    num_bytes: 5105873
-    num_examples: 3012
   - name: train
     num_bytes: 19732499
     num_examples: 12276
   - name: validation
     num_bytes: 3738331
     num_examples: 2265
+  - name: test
+    num_bytes: 5105873
+    num_examples: 3012
   download_size: 4796932
   dataset_size: 28576703
 ---