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:
   - name: text
     dtype: string
   splits:
-  - name: test
-    num_bytes: 344028
-    num_examples: 6121
   - name: train
     num_bytes: 3102158
     num_examples: 55134
+  - name: test
+    num_bytes: 344028
+    num_examples: 6121
   download_size: 2956114
   dataset_size: 3446186
 ---