docs: Fix weighting hook registration (#492)#493

ValerianRey merged 2 commits intoSimplexLab:mainSimplexLab/TorchJD:mainfrom

mattbuot:492-example-showing-how-to-register-weighting-hook-is-buggedmattbuot/torchjd:492-example-showing-how-to-register-weighting-hook-is-buggedCopy head branch name to clipboard