fix vision datasets doc (#9576)
fix vision datasets doc (#9576)


jamesliu/mxnet,yajiedesign/mxnet,jiajiechen/mxnet,jiajiechen/mxnet,dmlc/mxnet,luoyetx/mxnet,leezu/mxnet,larroy/mxnet,dmlc/mxnet,precedenceguo/mxnet,LinkHS/incubator-mxnet,LinkHS/incubator-mxnet,tornadomeet/mxnet,reminisce/mxnet,mbaijal/incubator-mxnet,TuSimple/mxnet,navrasio/mxnet,jiajiechen/mxnet,leezu/mxnet,TuSimple/mxnet,jiajiechen/mxnet,mbaijal/incubator-mxnet,yajiedesign/mxnet,indhub/mxnet,tlby/mxnet,larroy/mxnet,ForkedReposBak/mxnet,reminisce/mxnet,fullfanta/mxnet,CodingCat/mxnet,tornadomeet/mxnet,reminisce/mxnet,indhub/mxnet,ForkedReposBak/mxnet,szha/mxnet,LinkHS/incubator-mxnet,LinkHS/incubator-mxnet,fullfanta/mxnet,ForkedReposBak/mxnet,indhub/mxnet,precedenceguo/mxnet,tlby/mxnet,ForkedReposBak/mxnet,TuSimple/mxnet,precedenceguo/mxnet,yajiedesign/mxnet,fullfanta/mxnet,sxjscience/mxnet,rahul003/mxnet,rahul003/mxnet,rahul003/mxnet,navrasio/mxnet,dmlc/mxnet,ForkedReposBak/mxnet,leezu/mxnet,LinkHS/incubator-mxnet,CodingCat/mxnet,DickJC123/mxnet,zhreshold/mxnet,tlby/mxnet,dmlc/mxnet,szha/mxnet,jamesliu/mxnet,CodingCat/mxnet,indhub/mxnet,fullfanta/mxnet,jamesliu/mxnet,luoyetx/mxnet,rahul003/mxnet,leezu/mxnet,DickJC123/mxnet,eric-haibin-lin/mxnet,navrasio/mxnet,ptrendx/mxnet,leezu/mxnet,tlby/mxnet,mbaijal/incubator-mxnet,jamesliu/mxnet,tornadomeet/mxnet,tlby/mxnet,zhreshold/mxnet,precedenceguo/mxnet,CodingCat/mxnet,tlby/mxnet,rahul003/mxnet,indhub/mxnet,dmlc/mxnet,apache/incubator-mxnet,LinkHS/incubator-mxnet,reminisce/mxnet,tornadomeet/mxnet,precedenceguo/mxnet,DickJC123/mxnet,precedenceguo/mxnet,TuSimple/mxnet,ptrendx/mxnet,CodingCat/mxnet,LinkHS/incubator-mxnet,larroy/mxnet,zhreshold/mxnet,fullfanta/mxnet,dmlc/mxnet,precedenceguo/mxnet,larroy/mxnet,fullfanta/mxnet,CodingCat/mxnet,navrasio/mxnet,navrasio/mxnet,precedenceguo/mxnet,jiajiechen/mxnet,yajiedesign/mxnet,zhreshold/mxnet,indhub/mxnet,zhreshold/mxnet,ptrendx/mxnet,luoyetx/mxnet,jiajiechen/mxnet,dmlc/mxnet,larroy/mxnet,tlby/mxnet,sxjscience/mxnet,LinkHS/incubator-mxnet,tlby/mxnet,larroy/mxnet,navrasio/mxnet,sxjscience/mxnet,jamesliu/mxnet,jamesliu/mxnet,rahul003/mxnet,leezu/mxnet,larroy/mxnet,fullfanta/mxnet,yajiedesign/mxnet,indhub/mxnet,luoyetx/mxnet,sxjscience/mxnet,ptrendx/mxnet,ForkedReposBak/mxnet,tornadomeet/mxnet,jamesliu/mxnet,CodingCat/mxnet,sxjscience/mxnet,TuSimple/mxnet,tlby/mxnet,sxjscience/mxnet,CodingCat/mxnet,eric-haibin-lin/mxnet,rahul003/mxnet,szha/mxnet,eric-haibin-lin/mxnet,sxjscience/mxnet,larroy/mxnet,tornadomeet/mxnet,szha/mxnet,reminisce/mxnet,eric-haibin-lin/mxnet,leezu/mxnet,luoyetx/mxnet,ptrendx/mxnet,apache/incubator-mxnet,TuSimple/mxnet,LinkHS/incubator-mxnet,tornadomeet/mxnet,fullfanta/mxnet,mbaijal/incubator-mxnet,zhreshold/mxnet,navrasio/mxnet,ForkedReposBak/mxnet,dmlc/mxnet,ptrendx/mxnet,ptrendx/mxnet,szha/mxnet,reminisce/mxnet,yajiedesign/mxnet,TuSimple/mxnet,jiajiechen/mxnet,tlby/mxnet,yajiedesign/mxnet,CodingCat/mxnet,fullfanta/mxnet,luoyetx/mxnet,mbaijal/incubator-mxnet,leezu/mxnet,szha/mxnet,yajiedesign/mxnet,luoyetx/mxnet,ptrendx/mxnet,apache/incubator-mxnet,luoyetx/mxnet,sxjscience/mxnet,szha/mxnet,DickJC123/mxnet,ForkedReposBak/mxnet,yajiedesign/mxnet,eric-haibin-lin/mxnet,tornadomeet/mxnet,reminisce/mxnet,eric-haibin-lin/mxnet,luoyetx/mxnet,sxjscience/mxnet,eric-haibin-lin/mxnet,indhub/mxnet,zhreshold/mxnet,larroy/mxnet,szha/mxnet,ptrendx/mxnet,zhreshold/mxnet,zhreshold/mxnet,mbaijal/incubator-mxnet,TuSimple/mxnet,navrasio/mxnet,mbaijal/incubator-mxnet,rahul003/mxnet,mbaijal/incubator-mxnet,eric-haibin-lin/mxnet,TuSimple/mxnet,precedenceguo/mxnet,jamesliu/mxnet,reminisce/mxnet,rahul003/mxnet,ptrendx/mxnet,dmlc/mxnet,indhub/mxnet,jamesliu/mxnet,jiajiechen/mxnet,leezu/mxnet,ForkedReposBak/mxnet,tornadomeet/mxnet,mbaijal/incubator-mxnet,eric-haibin-lin/mxnet,szha/mxnet,apache/incubator-mxnet,TuSimple/mxnet,navrasio/mxnet,reminisce/mxnet,reminisce/mxnet,jiajiechen/mxnet