update readme and faq

Author: Ziwei Chang

README.md

@@ -19,7 +19,7 @@ G1手臂IK计算基于宇树官方示例[Unitree/xr_teleoperate](https://github.
 
 #### ros2_stark_ws
 
-本例中使用的灵巧手SDK与[原版SDK](https://github.com/BrainCoTech/stark-serialport-example/tree/revo2/ros2_stark_ws)区别: 
+本例中使用的灵巧手SDK与[原版SDK](https://github.com/BrainCoTech/stark-serialport-example/tree/main/ros2_stark_ws)区别: 
 强脑灵巧手与宇树G1通过**双485**串口通信，即单ROS节点中左右手分别通过`/dev/ttyUSB0`和`/dev/ttyUSB1`串口同时传输信息。
 - Brainco hands [stark_node.cpp](./ros2_stark_ws/src/ros2_stark_controller/src/stark_node.cpp)
 

README_en.md

@@ -19,7 +19,7 @@ G1 arm IK calculation is based on [Unitree/xr_teleoperate](https://github.com/un
 
 #### ros2_stark_ws
 
-Difference between this SDK version and [the original version](https://github.com/BrainCoTech/stark-serialport-example/tree/revo2/ros2_stark_ws):  
+Difference between this SDK version and [the original version](https://github.com/BrainCoTech/stark-serialport-example/tree/main/ros2_stark_ws):  
 The BrainCo hands communicates with Unitree G1 via **dual 485** serial ports, i.e., in a single ROS node, the left and right hands communicate simultaneously through `/dev/ttyUSB0` and `/dev/ttyUSB1`.
 - Brainco hands [stark_node.cpp](./ros2_stark_ws/src/ros2_stark_controller/src/stark_node.cpp)