add documentation that the returned vector is - perpendicular to this vector OR - perpendicular to the line between this and other vector split the method into `perpendicular` & `getNormal` - avoid confusion with `getNormal` of Vector3D #735 discussed a bit in #734
add documentation that the returned vector is
split the method into
perpendicular&getNormalgetNormalof Vector3D Crafty.math.Vector3D #735discussed a bit in #734