fix some typos in the fx ir test_fx_experiemntal (#48847)
Summary:
fix some typos in test_fx_experimental.py
Pull Request resolved: https://github.com/pytorch/pytorch/pull/48847
Reviewed By: malfet, gcatron
Differential Revision: D25339391
Pulled By: scottxu0730
fbshipit-source-id: 388d9da94259d2b306d59f3f4a167e486ac06d60
