update new_op doc (#7672)
update new_op doc (#7672)

* update new_op doc

* follow comment

chengduoZH/Paddle,jacquesqiao/Paddle,putcn/Paddle,luotao1/Paddle,luotao1/Paddle,reyoung/Paddle,Canpio/Paddle,Canpio/Paddle,QiJune/Paddle,chengduoZH/Paddle,putcn/Paddle,baidu/Paddle,reyoung/Paddle,PaddlePaddle/Paddle,baidu/Paddle,baidu/Paddle,lcy-seso/Paddle,luotao1/Paddle,PaddlePaddle/Paddle,jacquesqiao/Paddle,lcy-seso/Paddle,lcy-seso/Paddle,Canpio/Paddle,putcn/Paddle,PaddlePaddle/Paddle,reyoung/Paddle,putcn/Paddle,Canpio/Paddle,Canpio/Paddle,QiJune/Paddle,luotao1/Paddle,pkuyym/Paddle,pkuyym/Paddle,PaddlePaddle/Paddle,tensor-tang/Paddle,lcy-seso/Paddle,putcn/Paddle,baidu/Paddle,QiJune/Paddle,luotao1/Paddle,reyoung/Paddle,jacquesqiao/Paddle,luotao1/Paddle,reyoung/Paddle,lcy-seso/Paddle,chengduoZH/Paddle,tensor-tang/Paddle,pkuyym/Paddle,jacquesqiao/Paddle,tensor-tang/Paddle,baidu/Paddle,chengduoZH/Paddle,lcy-seso/Paddle,Canpio/Paddle,tensor-tang/Paddle,pkuyym/Paddle,putcn/Paddle,jacquesqiao/Paddle,PaddlePaddle/Paddle,Canpio/Paddle,QiJune/Paddle,reyoung/Paddle,pkuyym/Paddle,jacquesqiao/Paddle,pkuyym/Paddle,QiJune/Paddle,luotao1/Paddle,tensor-tang/Paddle,Canpio/Paddle,QiJune/Paddle,chengduoZH/Paddle,PaddlePaddle/Paddle,PaddlePaddle/Paddle