fix gramma, typo, code and rearrange paragraph
fix gramma, typo, code and rearrange paragraph

reyoung/Paddle,jacquesqiao/Paddle,pengli09/Paddle,cxysteven/Paddle,luotao1/Paddle,wen-bo-yang/Paddle,lispc/Paddle,tensor-tang/Paddle,livc/Paddle,hedaoyuan/Paddle,gangliao/Paddle,jacquesqiao/Paddle,lcy-seso/Paddle,chengduoZH/Paddle,cxysteven/Paddle,Canpio/Paddle,tensor-tang/Paddle,PaddlePaddle/Paddle,Canpio/Paddle,emailweixu/Paddle,yu239/Paddle,livc/Paddle,pkuyym/Paddle,putcn/Paddle,putcn/Paddle,PaddlePaddle/Paddle,emailweixu/Paddle,putcn/Paddle,emailweixu/Paddle,lcy-seso/Paddle,pengli09/Paddle,jacquesqiao/Paddle,wen-bo-yang/Paddle,hedaoyuan/Paddle,pengli09/Paddle,PaddlePaddle/Paddle,Canpio/Paddle,lcy-seso/Paddle,gangliao/Paddle,lcy-seso/Paddle,putcn/Paddle,lispc/Paddle,luotao1/Paddle,baidu/Paddle,lispc/Paddle,cxysteven/Paddle,wen-bo-yang/Paddle,lispc/Paddle,emailweixu/Paddle,pkuyym/Paddle,hedaoyuan/Paddle,reyoung/Paddle,chengduoZH/Paddle,gangliao/Paddle,reyoung/Paddle,pkuyym/Paddle,luotao1/Paddle,livc/Paddle,baidu/Paddle,pkuyym/Paddle,luotao1/Paddle,emailweixu/Paddle,pengli09/Paddle,gangliao/Paddle,gangliao/Paddle,tensor-tang/Paddle,PaddlePaddle/Paddle,yu239/Paddle,lcy-seso/Paddle,hedaoyuan/Paddle,hedaoyuan/Paddle,putcn/Paddle,cxysteven/Paddle,Canpio/Paddle,pengli09/Paddle,chengduoZH/Paddle,reyoung/Paddle,emailweixu/Paddle,livc/Paddle,lispc/Paddle,wen-bo-yang/Paddle,yu239/Paddle,livc/Paddle,pkuyym/Paddle,baidu/Paddle,cxysteven/Paddle,chengduoZH/Paddle,QiJune/Paddle,hedaoyuan/Paddle,luotao1/Paddle,jacquesqiao/Paddle,reyoung/Paddle,livc/Paddle,lispc/Paddle,pengli09/Paddle,luotao1/Paddle,gangliao/Paddle,PaddlePaddle/Paddle,cxysteven/Paddle,lcy-seso/Paddle,PaddlePaddle/Paddle,yu239/Paddle,tensor-tang/Paddle,chengduoZH/Paddle,luotao1/Paddle,wen-bo-yang/Paddle,baidu/Paddle,yu239/Paddle,QiJune/Paddle,hedaoyuan/Paddle,QiJune/Paddle,emailweixu/Paddle,lispc/Paddle,pengli09/Paddle,hedaoyuan/Paddle,Canpio/Paddle,QiJune/Paddle,gangliao/Paddle,tensor-tang/Paddle,wen-bo-yang/Paddle,Canpio/Paddle,Canpio/Paddle,pengli09/Paddle,yu239/Paddle,jacquesqiao/Paddle,jacquesqiao/Paddle,cxysteven/Paddle,wen-bo-yang/Paddle,QiJune/Paddle,QiJune/Paddle,yu239/Paddle,livc/Paddle,PaddlePaddle/Paddle,reyoung/Paddle,Canpio/Paddle,lispc/Paddle,pkuyym/Paddle,putcn/Paddle,baidu/Paddle,yu239/Paddle