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

@@ -59,15 +59,15 @@ dataset_info:
   - name: overlap_subset
     dtype: string
   splits:
-  - name: test
-    num_bytes: 40883586
-    num_examples: 7700
   - name: train
     num_bytes: 652754806
     num_examples: 120761
   - name: validation
     num_bytes: 47277039
     num_examples: 7700
+  - name: test
+    num_bytes: 40883586
+    num_examples: 7700
   download_size: 187724372
   dataset_size: 740915431
 ---