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

@@ -132,15 +132,15 @@ dataset_info:
           8: I-MISC
   config_name: conll2003
   splits:
-  - name: test
-    num_bytes: 1582054
-    num_examples: 3453
   - name: train
     num_bytes: 6931345
     num_examples: 14041
   - name: validation
     num_bytes: 1739223
     num_examples: 3250
+  - name: test
+    num_bytes: 1582054
+    num_examples: 3453
   download_size: 982975
   dataset_size: 10252622
 ---