removing references to the old/deprecated geodesy.gen_uuid as described

in https://github.com/ros-geographic-info/geographic_info/blob/e7d48ea6212d6900a3d73b840e4fba01a34e7696/geodesy/geodesy.gen_uuid.rst

geodesy.gen_uuid was removed with geographic_info-0.4.0
https://github.com/ros-geographic-info/geographic_info/issues/4