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

@@ -84,12 +84,12 @@ dataset_info:
     dtype: string
   config_name: yelp_review_full
   splits:
-  - name: test
-    num_bytes: 37271188
-    num_examples: 50000
   - name: train
     num_bytes: 483811554
     num_examples: 650000
+  - name: test
+    num_bytes: 37271188
+    num_examples: 50000
   download_size: 196146755
   dataset_size: 521082742
 ---