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

@@ -63,12 +63,12 @@ dataset_info:
       - name: Evidence End
         dtype: int32
   splits:
-  - name: test
-    num_bytes: 9436674
-    num_examples: 334
   - name: train
     num_bytes: 77045294
     num_examples: 2690
+  - name: test
+    num_bytes: 9436674
+    num_examples: 334
   - name: validation
     num_bytes: 10113982
     num_examples: 340
@@ -117,12 +117,12 @@ dataset_info:
       - name: Evidence End
         dtype: int32
   splits:
-  - name: test
-    num_bytes: 6877338
-    num_examples: 240
   - name: train
     num_bytes: 55375971
     num_examples: 1931
+  - name: test
+    num_bytes: 6877338
+    num_examples: 240
   - name: validation
     num_bytes: 7359847
     num_examples: 248