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

@@ -42,15 +42,15 @@ dataset_info:
       dtype: int32
   config_name: iapp_wiki_qa_squad
   splits:
-  - name: test
-    num_bytes: 2032016
-    num_examples: 739
   - name: train
     num_bytes: 16107541
     num_examples: 5761
   - name: validation
     num_bytes: 2120768
     num_examples: 742
+  - name: test
+    num_bytes: 2032016
+    num_examples: 739
   download_size: 2876630
   dataset_size: 20260325
 ---