Update COMPILE_CN.md

doc/COMPILE_CN.md

@@ -143,7 +143,7 @@ cmake -DPYTHON_INCLUDE_DIR=$PYTHON_INCLUDE_DIR \
     -DCUDA_TOOLKIT_ROOT_DIR=${CUDA_PATH} \
     -DCUDNN_LIBRARY=${CUDNN_LIBRARY} \
     -DCUDA_CUDART_LIBRARY=${CUDA_CUDART_LIBRARY} \
-    -DTENSORRT_ROOT=${TENSORRT_LIBRARY_PATH}
+    -DTENSORRT_ROOT=${TENSORRT_LIBRARY_PATH} \
     -DSERVER=ON \
     -DWITH_GPU=ON ..
 make -j10