text: Title: what is the width_multiple?
  Body: ### Search before asking
  
  - [X] I have searched the YOLOv5 [issues](https://github.com/ultralytics/yolov5/issues) and [discussions](https://github.com/ultralytics/yolov5/discussions) and found no similar questions.
  
  
  ### Question
  
  Hi, always grateful to use your YOLO.
  I have a question.
  
  I modified 'yolov5.yaml' by changing "s = [0.50, 0.50, 1024]" to "s =[0.44, 0.33, 1024]".
  
  I understand that the depth_multiple controls the number of Darknetbottleneck blocks.
  
  However, I don’t fully understand what width_multiple does. I know it generally affects the convolution channels, but I want to know exactly what it controls and how.
  Could you explain this in detail? Thanks.
  
  ### Additional
  
  _No response_