bug fix in hierarchical layer doc
bug fix in hierarchical layer doc

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