[Docs] Update QR Code

README_CN.md

@@ -50,7 +50,7 @@ PaddleRS具有以下五大特色：
 * 如果您发现任何PaddleRS存在的问题或是对PaddleRS有建议, 欢迎通过[GitHub Issues](https://github.com/PaddlePaddle/PaddleRS/issues)向我们提出。
 * 欢迎加入PaddleRS微信群：
 <div align="center">
-<img src="https://user-images.githubusercontent.com/21275753/209800487-6e2317cd-ba00-4a1d-8222-50b31b650f59.png"  width = "150" />  
+<img src="https://user-images.githubusercontent.com/21275753/210476095-a5ebdb51-bd04-4c52-8a9f-cbdd097bbff7.png"  width = "150" />  
 </div>
 
 ## <img src="./docs/images/model.png" width="30"/> 产品矩阵

README_EN.md

@@ -48,7 +48,7 @@ PaddleRS is an end-to-end high-efficent development toolkit for remote sensing a
 * If you have any questions, suggestions, or feature requests, please do not hesitate to create an issue in [GitHub Issues](https://github.com/PaddlePaddle/PaddleRS/issues).
 * Welcome to join PaddleRS WeChat group to communicate with us:
 <div align="center">
-<img src="https://user-images.githubusercontent.com/21275753/209800487-6e2317cd-ba00-4a1d-8222-50b31b650f59.png"  width = "150" />  
+<img src="https://user-images.githubusercontent.com/21275753/210476095-a5ebdb51-bd04-4c52-8a9f-cbdd097bbff7.png"  width = "150" />  
 </div>
 
 ## <img src="./docs/images/model.png" width="30"/> Overview

tools/prepare_dataset/prepare_isaid.py

@@ -17,7 +17,7 @@ from common import (get_default_parser, add_crop_options, crop_patches,
 # ├── test
 # │   └── images
 # │       ├── P0006.png
-# │       └── ...
+# │       ├── ...
 # │       └── P0009.png
 # ├── train
 # │   └── images