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

@@ -53,12 +53,12 @@ dataset_info:
     - name: Title
       dtype: string
   splits:
-  - name: test
-    num_bytes: 1353933
-    num_examples: 838
   - name: train
     num_bytes: 8538836
     num_examples: 5247
+  - name: test
+    num_bytes: 1353933
+    num_examples: 838
   - name: validation
     num_bytes: 966032
     num_examples: 597