Fix broken link to fx graph quant guide in quantization.rst (#56776)
Summary:
No oustanding issue, can create it if needed.
Was looking for that resource and it was moved without fixing the documentation.
Cheers
Pull Request resolved: https://github.com/pytorch/pytorch/pull/56776
Reviewed By: heitorschueroff
Differential Revision: D27967020
Pulled By: ezyang
fbshipit-source-id: a5cd7d554da43a9c9e44966ccd0b0ad9eef2948c
