Added note about FastSurfaceToDistanceField.
Added note about FastSurfaceToDistanceField.

ivoflipse/devide,nagyistoce/devide,ivoflipse/devide,zhangfangyan/devide,zhangfangyan/devide,chrisidefix/devide,fvpolpeta/devide,fvpolpeta/devide,nagyistoce/devide,chrisidefix/devide