qidoc: fix building in release

Change-Id: Ibc7f34dc63fe610b19e8a52be0c483da59afd458
Reviewed-on: http://gerrit.aldebaran.lan/41899
Tested-by: gerrit
Reviewed-by: vbarbaresi <vbarbaresi@aldebaran-robotics.com>
fix building doc in release

Previous commit was not enough :P

Change-Id: Ic429927e5e420aff729144e5802d8362dbe44393