[BE] Do not use unicode quotes (#99446)
They are mostly used in commented code examples, but even Python-3.12
does not recognize `“foobar”` as valid string literal
I.e. just `s/[“”]/"/`
Pull Request resolved: https://github.com/pytorch/pytorch/pull/99446
Approved by: https://github.com/huydhn, https://github.com/ezyang
