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

@@ -38,12 +38,12 @@ dataset_info:
   - name: text
     dtype: string
   splits:
-  - name: test
-    num_bytes: 2146857
-    num_examples: 9692
   - name: train
     num_bytes: 14362998
     num_examples: 70351
+  - name: test
+    num_bytes: 2146857
+    num_examples: 9692
   - name: validation
     num_bytes: 2407643
     num_examples: 10329