[jsk_perception/doc/vqa_node] add explanation about model argument #668

Job	Run time
ros (indigo, true, true, true, ros-ubuntu:14.04-pcl, sudo pip install numpy==1.16.6; sudo pip ins...	1h 23m 36s
ros (kinetic, true, true, true, ros-ubuntu:16.04-pcl, sudo pip install numpy==1.16.6; sudo pip in...	1h 1m 50s
ros (kinetic, true, true, true, ros-ubuntu:16.04-pcl, sudo pip install numpy==1.16.6; sudo pip in...	1h 9m 57s
ros (melodic, true, true, true, ros-ubuntu:18.04-pcl, sudo pip install numpy==1.16.6; sudo pip in...	1h 15m 4s
ros (melodic, true, true, true, ros-ubuntu:18.04-pcl, sudo pip install numpy==1.16.6; sudo pip in...	1h 20m 2s
ros (melodic, true, true, true, ros-ubuntu:18.04-pcl, sudo pip uninstall -y fcn chainer chainercv...	56m 44s
ros (noetic, false, true, true, ros-ubuntu:20.04-pcl, sudo pip3 install numpy==1.17.5 scipy==1.3....	1h 25m 2s
ros (noetic, false, true, true, ros-ubuntu:20.04-pcl, jsk_pcl_ros_utils jsk_pcl_ros, sudo pip3 in...	1h 53m 49s
ros (noetic, false, true, true, ros-ubuntu:20.04-pcl, jsk_recognition_msgs, sudo pip3 install num...	1h 18m 21s
	11h 44m 25s

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