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

@@ -65,15 +65,15 @@ dataset_info:
   - name: misc
     sequence: string
   splits:
-  - name: test
-    num_bytes: 193801708
-    num_examples: 101594
   - name: train
     num_bytes: 1254757266
     num_examples: 680792
   - name: validation
     num_bytes: 189534106
     num_examples: 101106
+  - name: test
+    num_bytes: 193801708
+    num_examples: 101594
   download_size: 212492611
   dataset_size: 1638093080
 ---