Update quantization.md link to quantize.py

[Jack-Khuu]

https://github.com/pytorch/torchchat/issues/1385

[pytorch-bot[bot]]

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As of commit 184eabdabc241e3819f2387e9b2abf96d7e2be82 with merge base f8211638a3423d35d4f4740323a0e6f295f39ba2 (): :green_heart: Looks good so far! There are no failures yet. :green_heart:

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