[fx] add documentation to AccOpProperties (#71450)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/71450
att
Test Plan: no test
Reviewed By: jfix71
Differential Revision: D33515471
fbshipit-source-id: ded40ca117f63c971d6c5ed4556932cc71c009ca
(cherry picked from commit a9f66d5921241645191c1df3292dc6e784860165)
