Update the doc of convs2s
Update the doc of convs2s

lcy-seso/models,kuke/models,PaddlePaddle/models,kuke/models,qingqing01/models,Superjom/models-1,kuke/models,lcy-seso/models,Superjom/models-1,lcy-seso/models,qingqing01/models,kuke/models,PaddlePaddle/models,Superjom/models-1,PaddlePaddle/models,qingqing01/models