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

@@ -70,15 +70,15 @@ dataset_info:
       dtype: string
   config_name: ehealth_kd
   splits:
-  - name: test
-    num_bytes: 47314
-    num_examples: 100
   - name: train
     num_bytes: 425713
     num_examples: 800
   - name: validation
     num_bytes: 108154
     num_examples: 199
+  - name: test
+    num_bytes: 47314
+    num_examples: 100
   download_size: 565900
   dataset_size: 581181
 ---