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

@@ -41,15 +41,15 @@ dataset_info:
   - name: id
     dtype: string
   splits:
-  - name: test
-    num_bytes: 26756165
-    num_examples: 11334
   - name: train
     num_bytes: 479206608
     num_examples: 204045
   - name: validation
     num_bytes: 26292901
     num_examples: 11332
+  - name: test
+    num_bytes: 26756165
+    num_examples: 11334
   download_size: 257302866
   dataset_size: 532255674
 ---