s/“pad”/"pad"/ in files introduced by #56065 (#56618)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/56618
Reviewed By: albanD
Differential Revision: D27919343
Pulled By: malfet
fbshipit-source-id: 2fac8ba5f399e050463141eba225da935c97a5ce
