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

@@ -44,12 +44,12 @@ dataset_info:
           3: nation
           4: sports
   splits:
-  - name: test
-    num_bytes: 17265514
-    num_examples: 4329
   - name: train
     num_bytes: 69400234
     num_examples: 17312
+  - name: test
+    num_bytes: 17265514
+    num_examples: 4329
   download_size: 0
   dataset_size: 86665748
 ---