Fix executable name in README

Author: EricDingNVD

README.md

@@ -90,15 +90,16 @@ Publisher:
 ```
 # Do this in a new terminal
 . ./install/setup.sh
-ros2 run rclrs_examples rclrs_publisher
+ros2 run rclrs_examples minimal_publisher
 ```
 
 Subscriber:
 
 ```
 # Do this in a new terminal
 . ./install/setup.sh
-ros2 run rclrs_examples rclrs_subscriber
+ros2 run rclrs_examples minimal_subscriber
+
 ```
 
 Enjoy!