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

@@ -111,12 +111,12 @@ dataset_info:
           7: B-MISC
           8: I-MISC
   splits:
-  - name: test
-    num_bytes: 909699
-    num_examples: 565
   - name: train
     num_bytes: 7311212
     num_examples: 4383
+  - name: test
+    num_bytes: 909699
+    num_examples: 565
   - name: validation
     num_bytes: 940413
     num_examples: 564