Make projected vs. wetted area option less confusing

[shamsheersc19]

The 'wetted' area option is for non-planar surfaces, to get a more complete reference area. The 'projected' area is a vertically projected area (e.g., vertical winglets would not contribute to this). However, 'wetted' generally means the total surface area (top and bottom) of the wing that is exposed to the air so this terminology is confusing. Maybe replace with an option: 'vertically_projected': True or False ?? Or something else. And explain somewhere in docs.