Merge remote-tracking branch 'origin/release/2.5' into release2.5

doc/doc_ch/ocr_book.md

@@ -20,8 +20,8 @@
 
 
 ## 资料地址
-- [notebook教程](../../notebook/notebook_ch/)
-- [教学视频](https://aistudio.baidu.com/aistudio/education/group/info/25207)
+- [notebook教程](https://github.com/PaddlePaddle/PaddleOCR/tree/dygraph/notebook/notebook_ch)
+- [教学视频与](https://aistudio.baidu.com/aistudio/education/group/info/25207)
 - 中文版电子书下载请扫描以下二维码入群后领取
 <div align="center">
 <img src="https://raw.githubusercontent.com/PaddlePaddle/PaddleOCR/dygraph/doc/joinus.PNG"  width = "200" height = "200" />

doc/doc_en/ocr_book_en.md

@@ -17,5 +17,5 @@
 
 ## Address
 - [E-book: *Dive Into OCR* (link generating)]()
-- [Jupyter notebook](../../notebook/notebook_en/)
+- [Jupyter notebook](https://github.com/PaddlePaddle/PaddleOCR/tree/dygraph/notebook/notebook_en)
 - [videos (Chinese only)](https://aistudio.baidu.com/aistudio/education/group/info/25207)