Update FreeBSD.md

FreeBSD.md

@@ -28,6 +28,12 @@ If snapshots return as dataset is busy upon deletion, they are either dependent
 zfs holds -r <snapshot_name>
 ```
 
+To release the snapshot from a tag
+
+```sh
+zfs release -r <tag_name> <snapshot_name>
+```
+
 ### Migrate dataset to new pool
 
 ```sh