FakeLowP Readme update (#38666)
Summary:
* fixed a typo source venv3/bin/active => source venv3/bin/activate
* Added instructions to set libomp.so path in LD_LIBRARY_PATH
Pull Request resolved: https://github.com/pytorch/pytorch/pull/38666
Reviewed By: amylittleyang
Differential Revision: D21622582
Pulled By: yinghai
fbshipit-source-id: a286b1a25fea7de8b692bfba19e60978fcb3c215
