README: Fix typo (#142)

Author: clementlgl

README.md

@@ -35,7 +35,7 @@ Is possible to use a micro-ROS Agent just with this docker command:
 docker run -it --rm -v /dev:/dev --privileged --net=host microros/micro-ros-agent:humble serial --dev [YOUR BOARD PORT] -v6
 
 # UDPv4 micro-ROS Agent
-docker run -it --rm --net=host microros/micro-ros-agent:humnle udp4 --port 8888 -v6
+docker run -it --rm --net=host microros/micro-ros-agent:humble udp4 --port 8888 -v6
 ```
 
 ## Purpose of the Project