Update stanford-cars docs with more elaborate instructions for download=False

[rygx]

The existing datasets are either missing some files or not fully conforming to the torchvision's required structures. So a lot of upfront manual work is needed every time to get ready.

To tackle this issue, a new dataset is created on Kaggle that is compatible with the latest version of torchvision: https://www.kaggle.com/datasets/rickyyyyyyy/torchvision-stanford-cars

Relevant comment: #7545 (comment)

[pytorch-bot]

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