Fix file path in build_docs (#19901)
Fix file path in build_docs (#19901)

Co-authored-by: Wei Chu <8d245f651bcd08b285ac3f36f14f72e6c2a75cb1@amazon.com>
tlby/mxnet,apache/incubator-mxnet,szha/mxnet,szha/mxnet,szha/mxnet,szha/mxnet,szha/mxnet,tlby/mxnet,tlby/mxnet,tlby/mxnet,szha/mxnet,tlby/mxnet,tlby/mxnet,tlby/mxnet,DickJC123/mxnet,tlby/mxnet,szha/mxnet,szha/mxnet,DickJC123/mxnet,apache/incubator-mxnet,DickJC123/mxnet,tlby/mxnet,szha/mxnet,apache/incubator-mxnet,apache/incubator-mxnet,DickJC123/mxnet,tlby/mxnet