[skip ci] Add comment for e2e.sh (#13224)

Signed-off-by: Jenny Li <jing.li@zilliz.com>

tests/scripts/e2e.sh

@@ -78,6 +78,7 @@ fi
     docker-compose up -d
   else
     if [[ "${MILVUS_CLIENT}" == "pymilvus" ]]; then
+      # better to run pytest under pytest workspace
       export MILVUS_PYTEST_WORKSPACE="/milvus/tests/python_client"
       docker-compose run --rm pytest /bin/bash -c "pytest -n ${PARALLEL_NUM} --host ${MILVUS_SERVICE_IP} --port ${MILVUS_SERVICE_PORT} \
                                                    --html=\${CI_LOG_PATH}/report.html --self-contained-html ${@:-}"