mypy

5e77c3e9 - Document --enable-incomplete-feature possible values in "mypy --help" (#16661)

Document --enable-incomplete-feature possible values in "mypy --help" (#16661) By the way, also remove `--enable-incomplete-feature=Unpack --enable-incomplete-feature=TypeVarTuple` when running the tests, as they are no more incomplete features. Fixes #14452 Co-authored-by: David Froger <david.froger@thrasos.ai>