UNICODE should mention UNICHAR and vise versa (same applies to CODE and CHAR) - either in the examples or in the description.
Olivier Hallot committed a patch related to this issue. It has been pushed to "master": http://cgit.freedesktop.org/libreoffice/help/commit/?id=f86e7a5fddca6c2079524296a287f599405ab347 tdf#103457 link UNICODE() to UNICHAR() in Help