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

@@ -39,12 +39,12 @@ dataset_info:
   - name: source
     dtype: string
   splits:
-  - name: test
-    num_bytes: 350275
-    num_examples: 1882
   - name: train
     num_bytes: 1418355
     num_examples: 7528
+  - name: test
+    num_bytes: 350275
+    num_examples: 1882
   download_size: 693026
   dataset_size: 1768630
 - config_name: enriched
@@ -70,12 +70,12 @@ dataset_info:
       - name: lemma
         dtype: string
   splits:
-  - name: test
-    num_bytes: 1182343
-    num_examples: 1882
   - name: train
     num_bytes: 4792366
     num_examples: 7528
+  - name: test
+    num_bytes: 1182343
+    num_examples: 1882
   download_size: 1822522
   dataset_size: 5974709
 ---