Notwithstanding any other provision of law, the description of easements and rights-of-way for public service corporation, telecommunications corporation or cable television system purposes reserved or conveyed in a conveyance document or other instrument executed prior to September 15, 1982 is not void for lack of a sufficient description of the course or width of the easement if the servient estate which is subject to the easement or right-of-way is sufficiently described.