T1P4 - change lane correction threshold

[DavidObando]

After the curvature is found, we're discarding the largest curvature anytime one of them is 4x bigger or 4x smaller than the other. This is causing some jittering at the end of the video, where we see 4x curvature differences that still make sense. Let's change this difference to be higher so this jittering is eliminated.

Also, fix the documentation to reflect this change.