docs: fix some translations

Author: sakumisu

README.md

@@ -22,7 +22,7 @@ In order to make it easier for users to learn USB basics, enumeration, driver lo
 In order to facilitate the use of the USB interface and to take into account the fact that users have learned about uart and dma, the following advantages have been designed for the data sending and receiving class of interface:
 
 - Equivalent to using uart tx dma/uart rx dma
-- There is no limit to the length of send and receive, the user does not need to care about the USB packetization process (the porting driver does the packetization process)
+- There is no limit to the length of send and receive, the user does not need to care about the USB packetization process (the porting driver does it)
 
 ### Easy to bring out USB performance
 
@@ -32,7 +32,7 @@ Taking into account USB performance issues and trying to achieve the theoretical
 - Memory zero copy
 - If IP has DMA then uses DMA mode (DMA with hardware packetization)
 - Unlimited length make it easier to interface with hardware DMA and take advantage of DMA
-- Subcontracting function is handled in interrupt
+- Packetization is handled in interrupt
 
 ## Directory Structure
 

README_zh.md

@@ -22,7 +22,7 @@ CherryUSB 是一个小而美的、可移植性高的、用于嵌入式系统(带
 为了方便用户使用 USB 接口，考虑到用户学习过 uart 和 dma，因此，设计的数据收发类接口具备以下优点：
 
 - 等价于使用 uart tx dma/uart rx dma
-- 收发长度没有限制，用户不需要关心 USB 分包过程（porting 驱动做分包过程）
+- 收发长度没有限制，用户不需要关心 USB 分包过程（分包过程在 porting 中处理）
 
 ### 易于发挥 USB 性能
 
@@ -32,7 +32,7 @@ CherryUSB 是一个小而美的、可移植性高的、用于嵌入式系统(带
 - Memory zero copy
 - IP 如果带 DMA 则使用 DMA 模式（DMA 带硬件分包功能）
 - 长度无限制，方便对接硬件 DMA 并且发挥 DMA 的优势
-- 分包功能在中断中处理
+- 分包过程在中断中执行
 
 ## 目录结构