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

@@ -40,12 +40,12 @@ dataset_info:
   - name: coherent_first_sentence
     dtype: string
   splits:
-  - name: test
-    num_bytes: 151656323
-    num_examples: 445521
   - name: train
     num_bytes: 14736279993
     num_examples: 43291020
+  - name: test
+    num_bytes: 151656323
+    num_examples: 445521
   - name: validation
     num_bytes: 150207737
     num_examples: 440902
@@ -70,12 +70,12 @@ dataset_info:
   - name: coherent_first_sentence
     dtype: string
   splits:
-  - name: test
-    num_bytes: 64008158
-    num_examples: 163657
   - name: train
     num_bytes: 6377924196
     num_examples: 16310585
+  - name: test
+    num_bytes: 64008158
+    num_examples: 163657
   - name: validation
     num_bytes: 65682035
     num_examples: 168081