[FSDP][BE] s/ConfigAutoWrap/_ConfigAutoWrap (#73759)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/73759
Closes https://github.com/pytorch/pytorch/issues/73757
ghstack-source-id: 150488948
Test Plan: CI
Reviewed By: zhaojuanmao
Differential Revision: D34627118
fbshipit-source-id: c262fea20c2d6dacdfe52a5aceddf7ae5da9303a
(cherry picked from commit 6f3b4a46e07ad3f810170ca71490adbae7215297)
