[bsp][wch] update v208 readme (#10045)

Author: kaidegit

…r0/CH32V208W-R0 Getting Started Guide.md bsp/wch/risc-v/ch32v208w-r0/README_EN.mdbsp/wch/risc-v/ch32v208w-r0/CH32V208W-R0 Getting Started Guide.md renamed to bsp/wch/risc-v/ch32v208w-r0/README_EN.md bsp/wch/risc-v/ch32v208w-r0/CH32V208W-R0 Getting Started Guide.md renamed to bsp/wch/risc-v/ch32v208w-r0/README_EN.md

@@ -1,6 +1,6 @@
 # CH32V208W-R0 User Guide
 
-**English** | [中文](./CH32V208W-R0上手指南.md)
+**英文** | [中文](./README.md)
 
 The CH32V208W-R0 supports RT-Studio projects, and this tutorial gives an example of development instructions for the RT-Studio environment.
 
@@ -56,7 +56,7 @@ RT-Thread has a number of software packages, which can be added to the project b
 
 ## 4 Networking with ESP8266 modules
 
-The ESP8266 is a cost-effective, highly integrated Wi-Fi MCU for IoT applications, and can also be used as a standalone WIFI module with the following physical diagram. ESP8266 modules usually support [AT](https://www.rt-thread.org/document/site/#/rt-thread-version/rt-thread-standard/programming-manual/at/at), RT-Thread provides an abstraction layer for these modules that support AT instructions, and this summary will use the AT group to communicate with ESP8266 and connect WIFI.
+The ESP8266 is a cost-effective, highly integrated Wi-Fi MCU for IoT applications, and can also be used as a standalone WIFI module with the following physical diagram. ESP8266 modules usually support [AT](https://www.rt-thread.org/document/site/#/rt- thread-version/rt-thread-standard/programming-manual/at/at), RT-Thread provides an abstraction layer for these modules that support AT instructions, and this summary will use the AT group to communicate with ESP8266 and connect WIFI.
 
 <img src="./figures/7esp8266.png" style="zoom:60%;" />