Feedback about What is torch.nn really?

There is the following issue on this page: https://docs.pytorch.org/tutorials/beginner/nn_tutorial.html

Github URL for MNIST archive needs to change from:
```
URL = "https://github.com/pytorch/tutorials/raw/main/_static/"
```
to

```
URL = 'https://github.com/pytorch/tutorials/raw/refs/heads/main/_static/'
```