Updated help documentation
Updated help documentation

fengzhyuan/mexopencv,fengzhyuan/mexopencv,ninghang/opencvmex,bearpaw/mexopencv,CVML/mexopencv,nanit/mexopencv,nanit/mexopencv,bearpaw/mexopencv,CVML/mexopencv,ninghang/opencvmex