Update annotations of layers.py according to comments
Update annotations of layers.py according to comments

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