Update README.md

update concat cmd to: `cat [DATASET_NAME]/part_* > [DATASET_NAME].tar.gz`

README.md

@@ -31,7 +31,7 @@ hf download --repo-type dataset haodongli/DA-2 --local-dir [YOUR_DATA_DIR]
 2. Merge parts into one `*.tar.gz` file:
 > `DATASET_NAME` in [`hypersim_pano`, `vkitti_pano`, `mvs_synth_pano`, `unreal4k_pano`, `3d-ken-burns_pano`, `dynamic_replica_v2_pano`]
 ```
-cat [DATASET_NAME].tar.gz [DATASET_NAME]/part_*
+cat [DATASET_NAME]/part_* > [DATASET_NAME].tar.gz
 ```
 3. Check the `MD5`:
 ```