Resolution support specifics can go in the notes for that screen type ("widescreen resolution" in this case) or under a section for that screen type if the explanation is too long to fit conveniently in the notes.
EDIT: issues that affect 3D support can go in the VR support section. I've added a very basic mention there now. If an issue only applies in 3D mode it would go under VR support instead of the regular video settings.