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

@@ -40,12 +40,12 @@ dataset_info:
           9: gündem
   config_name: 270k_10class
   splits:
-  - name: test
-    num_bytes: 179348267
-    num_examples: 54721
   - name: train
     num_bytes: 721110711
     num_examples: 218880
+  - name: test
+    num_bytes: 179348267
+    num_examples: 54721
   download_size: 342920336
   dataset_size: 900458978
 ---