lifecycle: change noun to verb for 'deactivate'

[gavanderhoorn]

As per subject.

Reading the rest of the article I'm pretty sure the transition is actually named deactivate, not deactive (which could be a state name).

[Karsten1987]

thanks for the patch. The transition is indeed called deactivate and the corresponding state inactive

https://github.com/ros2/rcl_interfaces/blob/master/lifecycle_msgs/msg/Transition.msg#L12 https://github.com/ros2/rcl_interfaces/blob/master/lifecycle_msgs/msg/State.msg#L10