Update `VGG` error rates

[nps1ngh]

Updated error according to numbers from: https://pytorch.org/vision/main/models.html#table-of-all-available-classification-weights. torchvision documentation version: main (0.15.0a0+23c2e5f ).

For consistency with the numbers from torchvision, I have not rounded the numbers to 2 decimal places but to 3 where necessary.

Closes #313.

As you say @NicolasHug in #318, I too think it might be for the best to refer to torchvision's documentation for accuracy numbers. Doing it like this is not ideal. Especially so, since this has a table of error rates and torchvision accuracies.

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