Why is the API doc for GraspHandPostureExecution not generated?

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While editing the katana package wiki page, I would like to link to the GraspHandPostureExecution. However, the following code...

goal {
  0.name = posture_action_name/goal
  0.type = object_manipulation_msgs/GraspHandPostureExecutionActionGoal
  0.desc = Enables one to open or close the gripper via the GRASP or RELEASE command or to move the gripper to a arbitrary position choosing the PRE-GRASP option.
}

...produces the following link: http://www.ros.org/doc/api/object_manipulation_msgs/html/msg/GraspHandPostureExecutionActionGoal.html, which is dead. Somehow, the API documentation for this action seems not to be generated. For other actions, this pattern works, e.g. here: http://www.ros.org/doc/api/move_base_msgs/html/msg/MoveBaseActionGoal.html.

BTW, a copy of the page I would like to link to seems to be here: http://www.ros.org/wiki/object_manipulation_msgs/GraspHandPostureExecutionAction.

So, my questions are: why is the API doc not generated, and why is there a copy? And how do I make the Clearsilver macro link to the correct page?