Document the static method plotv and give an example of its use.
Document the static method plotv and give an example of its use.

jaejunlee0538/robotics-toolbox-matlab,jaejunlee0538/robotics-toolbox-matlab,yasha0b1/robotics-toolbox-matlab,konradb3/robotics-toolbox-matlab,jaejunlee0538/robotics-toolbox-matlab,yasha0b1/robotics-toolbox-matlab,konradb3/robotics-toolbox-matlab,konradb3/robotics-toolbox-matlab,yasha0b1/robotics-toolbox-matlab,yasha0b1/robotics-toolbox-matlab,yasha0b1/robotics-toolbox-matlab,konradb3/robotics-toolbox-matlab,jaejunlee0538/robotics-toolbox-matlab,konradb3/robotics-toolbox-matlab,jaejunlee0538/robotics-toolbox-matlab