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

@@ -31,12 +31,12 @@ dataset_info:
   - name: sentence
     dtype: string
   splits:
-  - name: test
-    num_bytes: 86120227
-    num_examples: 760
   - name: train
     num_bytes: 1722002133
     num_examples: 11660
+  - name: test
+    num_bytes: 86120227
+    num_examples: 760
   download_size: 1475540500
   dataset_size: 1808122360
 ---