The writing instruction is simple. Take the assignment — a brief or a motion. Read it. Mark it. Bring it to the lawyer who wrote it. Sit with him or her. Review the changes. Explain your choices.Charles A. Laff — an intellectual property attorney at Michael, Best & Friedrich LLP — has followed that script since he began writing legal documents as a new lawyer in 1958. Now he’s the editor. “I remember sitting and going over briefs word by word,” said firm partner and Laff …