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

@@ -35,12 +35,12 @@ dataset_info:
           3: ORG
           4: PER
   splits:
-  - name: test
-    num_bytes: 755234
-    num_examples: 2453
   - name: train
     num_bytes: 2032630
     num_examples: 6886
+  - name: test
+    num_bytes: 755234
+    num_examples: 2453
   download_size: 1384558
   dataset_size: 2787864
 ---