Improved Usage example docstrings (#9075)

* Updated Usage examples

* Update detect.py

Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>

* Update predict.py

Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>

Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>

hubconf.py

@@ -1,11 +1,11 @@
 # YOLOv5 🚀 by Ultralytics, GPL-3.0 license
 """
-PyTorch Hub models https://pytorch.org/hub/ultralytics_yolov5/
+PyTorch Hub models https://pytorch.org/hub/ultralytics_yolov5
 
 Usage:
     import torch
     model = torch.hub.load('ultralytics/yolov5', 'yolov5s')
-    model = torch.hub.load('ultralytics/yolov5:master', 'custom', 'path/to/yolov5s.onnx')  # file from branch
+    model = torch.hub.load('ultralytics/yolov5:master', 'custom', 'path/to/yolov5s.onnx')  # custom model from branch
 """
 
 import torch