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

@@ -47,15 +47,15 @@ dataset_info:
           1: neutral
           2: contradiction
   splits:
-  - name: test
-    num_bytes: 1355409
-    num_examples: 10000
   - name: train
     num_bytes: 71175743
     num_examples: 550152
   - name: validation
     num_bytes: 1359639
     num_examples: 10000
+  - name: test
+    num_bytes: 1355409
+    num_examples: 10000
   download_size: 40328942
   dataset_size: 73890791
 - config_name: multinli_tr