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

@@ -60,15 +60,15 @@ dataset_info:
       - name: note
         dtype: string
   splits:
-  - name: test
-    num_bytes: 7880762248
-    num_examples: 968592
   - name: train
     num_bytes: 14705534822
     num_examples: 1798742
   - name: validation
     num_bytes: 1502956919
     num_examples: 185656
+  - name: test
+    num_bytes: 7880762248
+    num_examples: 968592
   download_size: 23310374002
   dataset_size: 24089253989
 ---