update index_en.rst (#9400)
update index_en.rst (#9400)

* update index_en.rst

* fix comments

* fix uppercase

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