Update Dockerfile headers (#13546)

utils/docker/Dockerfile

@@ -1,4 +1,5 @@
-# YOLOv5 🚀 by Ultralytics, AGPL-3.0 license
+# Ultralytics 🚀 AGPL-3.0 License - https://ultralytics.com/license
+
 # Builds ultralytics/yolov5:latest image on DockerHub https://hub.docker.com/r/ultralytics/yolov5
 # Image is CUDA-optimized for YOLOv5 single/multi-GPU training and inference
 

utils/docker/Dockerfile-arm64

@@ -1,4 +1,5 @@
-# YOLOv5 🚀 by Ultralytics, AGPL-3.0 license
+# Ultralytics 🚀 AGPL-3.0 License - https://ultralytics.com/license
+
 # Builds ultralytics/yolov5:latest-arm64 image on DockerHub https://hub.docker.com/r/ultralytics/yolov5
 # Image is aarch64-compatible for Apple M1 and other ARM architectures i.e. Jetson Nano and Raspberry Pi
 

utils/docker/Dockerfile-cpu

@@ -1,4 +1,5 @@
-# YOLOv5 🚀 by Ultralytics, AGPL-3.0 license
+# Ultralytics 🚀 AGPL-3.0 License - https://ultralytics.com/license
+
 # Builds ultralytics/yolov5:latest-cpu image on DockerHub https://hub.docker.com/r/ultralytics/yolov5
 # Image is CPU-optimized for ONNX, OpenVINO and PyTorch YOLOv5 deployments