Fix the typo error and add more comments.
Fix the typo error and add more comments.

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