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

@@ -28,15 +28,15 @@ dataset_info:
   - name: code
     sequence: string
   splits:
-  - name: test
-    num_bytes: 43027956
-    num_examples: 8268
   - name: train
     num_bytes: 128312061
     num_examples: 12934
   - name: validation
     num_bytes: 30259174
     num_examples: 7189
+  - name: test
+    num_bytes: 43027956
+    num_examples: 8268
   download_size: 126856519
   dataset_size: 201599191
 - config_name: python
@@ -48,12 +48,12 @@ dataset_info:
   - name: code
     sequence: string
   splits:
-  - name: test
-    num_bytes: 333978088
-    num_examples: 50000
   - name: train
     num_bytes: 684319575
     num_examples: 100000
+  - name: test
+    num_bytes: 333978088
+    num_examples: 50000
   download_size: 199067128
   dataset_size: 1018297663
 ---