docs: update renamed `every_n_batch`
docs: update renamed `every_n_batch`

ref: #407
[ci skip]

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