docs(changelog): update CHANGELOG.md

CHANGELOG.md

@@ -6,13 +6,13 @@ pi0_datasets_v0.1.0 (2026-1-27)
 
 pi0_datasets_v0.2.0 (2026-2-2)
 ------------------
-1. Add **hdf5** datasets for task: put the yellow mango_on the blue plate.
+1. Add **hdf5** datasets for task: put the yellow mango on the blue plate.
 
 pi0_datasets_v0.2.1 (2026-2-2)
 ------------------
 1. Add **lerobot** datasets for task: put the box.
-2. Add **lerobot** datasets for task: put the yellow mango_on the blue plate.
+2. Add **lerobot** datasets for task: put the yellow mango on the blue plate.
 
 pi0_datasets_v0.2.2 (2026-2-3)
 ------------------
-1. Add **rosbag** datasets for task: put the yellow mango_on the blue plate.
+1. Add **rosbag** datasets for task: put the yellow mango on the blue plate.