Summary:
Remove sphinx-autodoc-typehints from the sphinx/source/conf.py file. This was breaking our sphinx build, and is a temporary solution that will remove typehints from our docs.

Pull Request resolved: https://github.com/facebook/Ax/pull/419

Reviewed By: lena-kashtelyan

Differential Revision: D24715038

Pulled By: Jakepodell

fbshipit-source-id: 7133ab2b09f6b418488f475bf21497c19daebc3d