Added usuage of rqt_joint_trajectory_controller in documentation of e… #2011

Job	Run time
binary (jazzy, main) / jazzy main	10m 0s
binary (jazzy, testing) / jazzy testing	9m 41s
binary (rolling, main) / rolling main	10m 40s
binary (rolling, testing) / rolling testing	9m 56s
	40m 17s

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