Update script headers (#4163)

* Update download script headers

* cleanup

* bug fix attempt

* bug fix attempt2

* bug fix attempt3

* cleanup

data/scripts/download_weights.sh

@@ -1,7 +1,12 @@
 #!/bin/bash
+# Copyright Ultralytics https://ultralytics.com, licensed under GNU GPL v3.0
 # Download latest models from https://github.com/ultralytics/yolov5/releases
-# Usage:
-#    $ bash path/to/download_weights.sh
+# YOLOv5 🚀 example usage: bash path/to/download_weights.sh
+# parent
+# └── yolov5
+#     ├── yolov5s.pt  ← downloads here
+#     ├── yolov5m.pt
+#     └── ...
 
 python - <<EOF
 from utils.google_utils import attempt_download