Update static quantization tutorial code link to go to mobilenetv2.py (pytorch#2638)

The link says most of the code is from "here", but it goes to mobilenet.py which is just imports.
Most of the code comes from mobilenetv2.py.

Signed-off-by: markstur <[email protected]>
Co-authored-by: Svetlana Karslioglu <[email protected]>

Author: markstur

advanced_source/static_quantization_tutorial.rst

@@ -59,7 +59,7 @@ to enable quantization:
 - Replace ReLU6 with ReLU 
 
 Note: this code is taken from 
-`here <https://github.com/pytorch/vision/blob/master/torchvision/models/mobilenet.py>`_.  
+`here <https://github.com/pytorch/vision/blob/main/torchvision/models/mobilenetv2.py>`_.
 
 .. code:: python