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

@@ -38,15 +38,15 @@ dataset_info:
   - name: tree
     dtype: string
   splits:
-  - name: test
-    num_bytes: 730154
-    num_examples: 2210
   - name: train
     num_bytes: 2818768
     num_examples: 8544
   - name: validation
     num_bytes: 366205
     num_examples: 1101
+  - name: test
+    num_bytes: 730154
+    num_examples: 2210
   download_size: 7162356
   dataset_size: 3915127
 - config_name: dictionary
@@ -66,15 +66,15 @@ dataset_info:
   - name: ptb_tree
     dtype: string
   splits:
-  - name: test
-    num_bytes: 566248
-    num_examples: 2210
   - name: train
     num_bytes: 2185694
     num_examples: 8544
   - name: validation
     num_bytes: 284132
     num_examples: 1101
+  - name: test
+    num_bytes: 566248
+    num_examples: 2210
   download_size: 7162356
   dataset_size: 3036074
 ---