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

@@ -248,12 +248,12 @@ dataset_info:
           0: 'false'
           1: 'true'
   splits:
-  - name: test
-    num_bytes: 1253810
-    num_examples: 2629
   - name: train
     num_bytes: 10060799
     num_examples: 21046
+  - name: test
+    num_bytes: 1253810
+    num_examples: 2629
   - name: validation
     num_bytes: 1266874
     num_examples: 2573