[doc] pre-commit fix instructions (#61717)
Summary:
fix invalid instruction
Pull Request resolved: https://github.com/pytorch/pytorch/pull/61717
Reviewed By: zhouzhuojie, driazati
Differential Revision: D30359218
Pulled By: malfet
fbshipit-source-id: 61771babeac4d34425a61ce49f38a7099b521eec
