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

@@ -71,15 +71,15 @@ dataset_info:
     dtype: string
   config_name: 1.0.0
   splits:
-  - name: test
-    num_bytes: 20936820
-    num_examples: 5593
   - name: train
     num_bytes: 309436493
     num_examples: 82022
   - name: validation
     num_bytes: 21311817
     num_examples: 5592
+  - name: test
+    num_bytes: 20936820
+    num_examples: 5593
   download_size: 89591141
   dataset_size: 351685130
 ---