docs: refine the local office AI assistant slogan

Signed-off-by: hy <xiaoyuan9816@gmail.com>

README.en.md

@@ -4,7 +4,7 @@
 
 <h1 align="center">NCurator</h1>
 
-<p align="center"><strong>Building the most user-friendly AI assistant for local office documents</strong></p>
+<p align="center"><strong>Building the most user-friendly AI assistant for working with local office documents</strong></p>
 
 <p align="center">
   <a href="./README.md">简体中文</a> · <strong>English</strong>

README.md

@@ -4,7 +4,7 @@
 
 <h1 align="center">馆长</h1>
 
-<p align="center"><strong>打造最好用的本地办公文件的 AI 助手</strong></p>
+<p align="center"><strong>打造最好用的处理本地办公文件的 AI 助手</strong></p>
 
 <p align="center">
   <strong>简体中文</strong> · <a href="./README.en.md">English</a>