fix doc of sym.RNN (#11135)
fix doc of sym.RNN (#11135)


yajiedesign/mxnet,larroy/mxnet,leezu/mxnet,rahul003/mxnet,precedenceguo/mxnet,indhub/mxnet,navrasio/mxnet,rahul003/mxnet,DickJC123/mxnet,mbaijal/incubator-mxnet,jamesliu/mxnet,tlby/mxnet,jamesliu/mxnet,ForkedReposBak/mxnet,larroy/mxnet,szha/mxnet,indhub/mxnet,reminisce/mxnet,yajiedesign/mxnet,dmlc/mxnet,leezu/mxnet,zhreshold/mxnet,tlby/mxnet,yajiedesign/mxnet,sxjscience/mxnet,reminisce/mxnet,tlby/mxnet,szha/mxnet,ForkedReposBak/mxnet,indhub/mxnet,eric-haibin-lin/mxnet,DickJC123/mxnet,eric-haibin-lin/mxnet,mbaijal/incubator-mxnet,dmlc/mxnet,navrasio/mxnet,yajiedesign/mxnet,zhreshold/mxnet,sxjscience/mxnet,eric-haibin-lin/mxnet,precedenceguo/mxnet,mbaijal/incubator-mxnet,mbaijal/incubator-mxnet,larroy/mxnet,yajiedesign/mxnet,leezu/mxnet,zhreshold/mxnet,ptrendx/mxnet,navrasio/mxnet,sxjscience/mxnet,jamesliu/mxnet,mbaijal/incubator-mxnet,zhreshold/mxnet,leezu/mxnet,dmlc/mxnet,tlby/mxnet,szha/mxnet,rahul003/mxnet,ptrendx/mxnet,indhub/mxnet,leezu/mxnet,yajiedesign/mxnet,eric-haibin-lin/mxnet,tlby/mxnet,rahul003/mxnet,sxjscience/mxnet,szha/mxnet,precedenceguo/mxnet,ForkedReposBak/mxnet,ptrendx/mxnet,tlby/mxnet,apache/incubator-mxnet,larroy/mxnet,jamesliu/mxnet,jamesliu/mxnet,leezu/mxnet,szha/mxnet,indhub/mxnet,rahul003/mxnet,szha/mxnet,navrasio/mxnet,ptrendx/mxnet,navrasio/mxnet,eric-haibin-lin/mxnet,tlby/mxnet,sxjscience/mxnet,zhreshold/mxnet,leezu/mxnet,yajiedesign/mxnet,precedenceguo/mxnet,jamesliu/mxnet,ptrendx/mxnet,ForkedReposBak/mxnet,ForkedReposBak/mxnet,dmlc/mxnet,leezu/mxnet,indhub/mxnet,sxjscience/mxnet,tlby/mxnet,DickJC123/mxnet,ptrendx/mxnet,reminisce/mxnet,tlby/mxnet,jamesliu/mxnet,eric-haibin-lin/mxnet,reminisce/mxnet,dmlc/mxnet,dmlc/mxnet,yajiedesign/mxnet,ptrendx/mxnet,larroy/mxnet,szha/mxnet,dmlc/mxnet,rahul003/mxnet,navrasio/mxnet,reminisce/mxnet,navrasio/mxnet,zhreshold/mxnet,zhreshold/mxnet,jamesliu/mxnet,zhreshold/mxnet,ForkedReposBak/mxnet,apache/incubator-mxnet,rahul003/mxnet,dmlc/mxnet,ForkedReposBak/mxnet,ForkedReposBak/mxnet,eric-haibin-lin/mxnet,mbaijal/incubator-mxnet,rahul003/mxnet,indhub/mxnet,zhreshold/mxnet,eric-haibin-lin/mxnet,mbaijal/incubator-mxnet,larroy/mxnet,reminisce/mxnet,leezu/mxnet,dmlc/mxnet,navrasio/mxnet,szha/mxnet,reminisce/mxnet,ptrendx/mxnet,DickJC123/mxnet,sxjscience/mxnet,navrasio/mxnet,jamesliu/mxnet,reminisce/mxnet,tlby/mxnet,ptrendx/mxnet,larroy/mxnet,rahul003/mxnet,precedenceguo/mxnet,precedenceguo/mxnet,larroy/mxnet,mbaijal/incubator-mxnet,sxjscience/mxnet,indhub/mxnet,mbaijal/incubator-mxnet,szha/mxnet,apache/incubator-mxnet,indhub/mxnet,eric-haibin-lin/mxnet,precedenceguo/mxnet,precedenceguo/mxnet,reminisce/mxnet,precedenceguo/mxnet,yajiedesign/mxnet,sxjscience/mxnet,ForkedReposBak/mxnet,apache/incubator-mxnet,larroy/mxnet,ptrendx/mxnet,reminisce/mxnet