update the ros setup tutorial for ROS_TCP_PORT (#256)

Author: peifeng-unity

tutorials/pick_and_place/0_ros_setup.md

@@ -92,6 +92,8 @@ The ROS workspace is now ready to accept commands!
     ROS_IP: 192.168.50.149
     ```
 
+1. (Optional) By default, the server_endpoint will listen on port 10000, but this is also controlled by a parameter. If you need to change it, you can run the command `rosparam set ROS_TCP_PORT 10000`, replacing 10000 with the desired port number.
+
 The ROS workspace is now ready to accept commands!
 
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