update rmm tag path (#14195)

PR updates the download path of the `rmm` tag used in `build_docs.sh` following the re-arrangement of the docs directories.

Authors:
  - Jake Awe (https://github.com/AyodeAwe)

Approvers:
  - AJ Schmidt (https://github.com/ajschmidt8)

URL: #14195

ci/build_docs.sh

@@ -30,7 +30,7 @@ export RAPIDS_DOCS_DIR="$(mktemp -d)"
 
 rapids-logger "Build CPP docs"
 pushd cpp/doxygen
-aws s3 cp s3://rapidsai-docs/librmm/${RAPIDS_VERSION_NUMBER}/html/rmm.tag . || echo "Failed to download rmm Doxygen tag"
+aws s3 cp s3://rapidsai-docs/librmm/html/${RAPIDS_VERSION_NUMBER}/rmm.tag . || echo "Failed to download rmm Doxygen tag"
 doxygen Doxyfile
 mkdir -p "${RAPIDS_DOCS_DIR}/libcudf/html"
 mv html/* "${RAPIDS_DOCS_DIR}/libcudf/html"