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

@@ -27,15 +27,15 @@ dataset_info:
   - name: human_reference
     dtype: string
   splits:
-  - name: test
-    num_bytes: 1320205
-    num_examples: 4693
   - name: train
     num_bytes: 9435824
     num_examples: 42061
   - name: validation
     num_bytes: 1171723
     num_examples: 4672
+  - name: test
+    num_bytes: 1320205
+    num_examples: 4693
   download_size: 11812316
   dataset_size: 11927752
 ---