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

@@ -28,12 +28,12 @@ dataset_info:
   - name: summary
     dtype: string
   splits:
-  - name: test
-    num_bytes: 3785207
-    num_examples: 1500
   - name: train
     num_bytes: 53531651
     num_examples: 21401
+  - name: test
+    num_bytes: 3785207
+    num_examples: 1500
   - name: validation
     num_bytes: 3698650
     num_examples: 1500
@@ -46,12 +46,12 @@ dataset_info:
   - name: summary
     dtype: string
   splits:
-  - name: test
-    num_bytes: 3176690
-    num_examples: 1500
   - name: train
     num_bytes: 65225136
     num_examples: 30659
+  - name: test
+    num_bytes: 3176690
+    num_examples: 1500
   - name: validation
     num_bytes: 3276713
     num_examples: 1500