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

@@ -31,18 +31,18 @@ dataset_info:
   - name: label
     sequence: string
   splits:
-  - name: full
-    num_bytes: 15536883723
-    num_examples: 14393619
-  - name: test
-    num_bytes: 1190766821
-    num_examples: 1000000
   - name: train
     num_bytes: 3573399948
     num_examples: 3000000
+  - name: test
+    num_bytes: 1190766821
+    num_examples: 1000000
   - name: validation
     num_bytes: 1191410723
     num_examples: 1000000
+  - name: full
+    num_bytes: 15536883723
+    num_examples: 14393619
   download_size: 21060929078
   dataset_size: 21492461215
 ---