update comments on fake operator (#36086)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/36086
update comments
Test Plan:
internal tests pass
buck test //glow/fb/test/numerics/...
Reviewed By: yinghai
Differential Revision: D20875297
fbshipit-source-id: f0dde406c66ab6c9e5cb1c4f669f162486fefda0
