Fix command example (#72847)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/72847
Reviewed By: malfet
Differential Revision: D34260868
Pulled By: kit1980
fbshipit-source-id: 1b225f3c2c7a822e44df4bbd91766e6533eab6d7
(cherry picked from commit c9e874c4d81a8f9ceee820e243c47b47a4361320)
