Update script headers (#4163)

* Update download script headers

* cleanup

* bug fix attempt

* bug fix attempt2

* bug fix attempt3

* cleanup

data/scripts/get_coco.sh

@@ -1,11 +1,11 @@
 #!/bin/bash
-# COCO 2017 dataset http://cocodataset.org
-# Download command: bash data/scripts/get_coco.sh
-# Train command: python train.py --data coco.yaml
-# Default dataset location is next to YOLOv5:
-#   /parent_folder
-#     /coco
-#     /yolov5
+# Copyright Ultralytics https://ultralytics.com, licensed under GNU GPL v3.0
+# Download COCO 2017 dataset http://cocodataset.org
+# YOLOv5 🚀 example usage: bash data/scripts/get_coco.sh
+# parent
+# ├── yolov5
+# └── datasets
+#     └── coco  ← downloads here
 
 # Download/unzip labels
 d='../datasets' # unzip directory