Shader Model 3.0 is a Direct3D feature that has nothing to do with OpenGL. It seems the guys that wrote the FAQ for Farming Simulator have no idea what they're talking about.
Also, no, you can't update your OpenGL version past 2.1; that's as high as the 1st generation HD Graphics can go. If Farming Simulator 15 really does require OpenGL 3.0, then you need a new laptop. Any supported upgrades won't give you the OpenGL 3.0 you need.