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

@@ -45,12 +45,12 @@ dataset_info:
     dtype: string
   config_name: dbpedia_14
   splits:
-  - name: test
-    num_bytes: 22310285
-    num_examples: 70000
   - name: train
     num_bytes: 178428970
     num_examples: 560000
+  - name: test
+    num_bytes: 22310285
+    num_examples: 70000
   download_size: 68341743
   dataset_size: 200739255
 ---