update readme about device description (#720)

Co-authored-by: Mark-ZhouWX <zhouwuxing000@gmail.com>

Author: Mark-ZhouWX

README.md

@@ -48,8 +48,7 @@ MindOCR is an open-source toolbox for OCR development and application based on [
 
 #### Prerequisites
 
-MindOCR is built on MindSpore AI framework, which supports CPU/GPU/NPU devices.
-MindOCR is compatible with the following framework versions. For details and installation guideline, please refer to the installation links shown below.
+MindOCR is built on MindSpore AI framework and is compatible with the following framework versions. For details and installation guideline, please refer to the installation links shown below.
 
 - mindspore >= 2.2.0 [[install](https://www.mindspore.cn/install)]
 - python >= 3.7

README_CN.md

@@ -43,7 +43,7 @@ MindOCR是一个基于[MindSpore](https://www.mindspore.cn/en) 框架开发的OC
 
 #### MindSpore相关环境准备
 
-MindOCR基于MindSpore AI框架（支持CPU/GPU/NPU）开发，并适配以下框架版本。安装方式请参见下方的安装链接。
+MindOCR基于MindSpore AI框架开发，并适配以下框架版本。安装方式请参见下方的安装链接。
 
 - mindspore >= 2.2.0 [[安装](https://www.mindspore.cn/install)]
 - python >= 3.7