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

@@ -1482,15 +1482,15 @@ dataset_info:
         - 3
         dtype: int16
   splits:
-  - name: test
-    num_bytes: 466191706
-    num_examples: 862500
   - name: train
     num_bytes: 13056229420
     num_examples: 24150000
   - name: validation
     num_bytes: 466485546
     num_examples: 862500
+  - name: test
+    num_bytes: 466191706
+    num_examples: 862500
   download_size: 3928904911
   dataset_size: 13988906672
 - config_name: sketch_rnn_full
@@ -1852,15 +1852,15 @@ dataset_info:
         - 3
         dtype: int16
   splits:
-  - name: test
-    num_bytes: 466191706
-    num_examples: 862500
   - name: train
     num_bytes: 23725242280
     num_examples: 43988874
   - name: validation
     num_bytes: 466485546
     num_examples: 862500
+  - name: test
+    num_bytes: 466191706
+    num_examples: 862500
   download_size: 6928245966
   dataset_size: 24657919532
 ---