update multi lang doc

doc/doc_ch/multi_languages.md

@@ -2,7 +2,7 @@
 
 **近期更新**
 
-- 2022.5.8 更新`PP-OCRv3`的检测和识别
+- 2022.5.8 更新`PP-OCRv3`版 多语言检测和识别模型，平均识别准确率提升5%以上。
 - 2021.4.9 支持**80种**语言的检测和识别
 - 2021.4.9 支持**轻量高精度**英文模型检测识别
 

doc/doc_en/multi_languages_en.md

@@ -2,7 +2,7 @@
 
 **Recent Update**
 
-- 2022.5.8 update `PP-OCRv3` detection and recognition
+- 2022.5.8 update the `PP-OCRv3` version of the multi-language detection and recognition model, and the average recognition accuracy has increased by more than 5%.
 - 2021.4.9 supports the detection and recognition of 80 languages
 - 2021.4.9 supports **lightweight high-precision** English model detection and recognition