naviframe: Better structure packing for naviframe item and added more description about item structure members.
naviframe: Better structure packing for naviframe item and added more
description about item structure members.

tasn/elementary,FlorentRevest/Elementary,rvandegrift/elementary,tasn/elementary,FlorentRevest/Elementary,rvandegrift/elementary,FlorentRevest/Elementary,rvandegrift/elementary,tasn/elementary,rvandegrift/elementary,tasn/elementary,FlorentRevest/Elementary,tasn/elementary