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: target
     dtype: string
   splits:
-  - name: test_all
-    num_bytes: 184180
-    num_examples: 3146
-  - name: test_core
-    num_bytes: 62652
-    num_examples: 1132
   - name: train
     num_bytes: 825865
     num_examples: 10444
+  - name: test_core
+    num_bytes: 62652
+    num_examples: 1132
+  - name: test_all
+    num_bytes: 184180
+    num_examples: 3146
   download_size: 985463
   dataset_size: 1072697
 ---