fix cpp infer doc for cls

deploy/cpp_infer/readme.md

@@ -193,6 +193,9 @@ make -j
 sh tools/run.sh
 ```
 
+* 若需要使用方向分类器，则需要将`tools/config.txt`中的`use_angle_cls`参数修改为1，表示开启方向分类器的预测。
+
+
 最终屏幕上会输出检测结果如下。
 
 <div align="center">

deploy/cpp_infer/readme_en.md

@@ -162,7 +162,7 @@ inference/
 sh tools/build.sh
 ```
 
-具体地，`tools/build.sh`中内容如下。
+Specifically, the content in `tools/build.sh` is as follows.
 
 ```shell
 OPENCV_DIR=your_opencv_dir
@@ -201,6 +201,8 @@ make -j
 sh tools/run.sh
 ```
 
+* If you want to orientation classifier to correct the detected boxes, you can set `use_angle_cls` in the file `tools/config.txt` as 1 to enable the function.
+
 The detection results will be shown on the screen, which is as follows.
 
 <div align="center">

deploy/cpp_infer/tools/config.txt

@@ -15,7 +15,7 @@ det_model_dir  ./inference/det_db
 
 # cls config
 use_angle_cls 0
-cls_model_dir ../inference/cls
+cls_model_dir ./inference/cls
 cls_thresh  0.9
 
 # rec config