Standardize headers and docstrings (#4417)

* Implement new headers

* Reformat 1

* Reformat 2

* Reformat 3 - math

* Reformat 4 - yaml

data/hyps/hyp.finetune.yaml

@@ -1,8 +1,8 @@
+# YOLOv5 🚀 by Ultralytics, GPL-3.0 license
 # Hyperparameters for VOC finetuning
 # python train.py --batch 64 --weights yolov5m.pt --data VOC.yaml --img 512 --epochs 50
 # See tutorials for hyperparameter evolution https://github.com/ultralytics/yolov5#tutorials
 
-
 # Hyperparameter Evolution Results
 # Generations: 306
 #                   P         R     mAP.5 mAP.5:.95       box       obj       cls