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: summary
     dtype: string
   splits:
-  - name: test
-    num_bytes: 70032124
-    num_examples: 5622
   - name: train
     num_bytes: 558392265
     num_examples: 44972
   - name: validation
     num_bytes: 68272432
     num_examples: 5622
+  - name: test
+    num_bytes: 70032124
+    num_examples: 5622
   download_size: 756785627
   dataset_size: 696696821
 ---