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

@@ -72,12 +72,12 @@ dataset_info:
     - name: creator
       dtype: string
   splits:
-  - name: test
-    num_bytes: 34284777
-    num_examples: 637
   - name: train
     num_bytes: 571263679
     num_examples: 11090
+  - name: test
+    num_bytes: 34284777
+    num_examples: 637
   - name: validation
     num_bytes: 32488519
     num_examples: 637
@@ -145,12 +145,12 @@ dataset_info:
     - name: impact
       dtype: string
   splits:
-  - name: test
-    num_bytes: 878906
-    num_examples: 637
   - name: train
     num_bytes: 15234922
     num_examples: 11090
+  - name: test
+    num_bytes: 878906
+    num_examples: 637
   - name: validation
     num_bytes: 864799
     num_examples: 637