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

@@ -35,15 +35,15 @@ dataset_info:
     dtype: bool
   config_name: sede
   splits:
-  - name: test
-    num_bytes: 386599
-    num_examples: 857
   - name: train
     num_bytes: 4410584
     num_examples: 10309
   - name: validation
     num_bytes: 380942
     num_examples: 857
+  - name: test
+    num_bytes: 386599
+    num_examples: 857
   download_size: 6318959
   dataset_size: 5178125
 ---