If you would like to add some editing to your income stream, keep a sharp eye on what you read. Just today I was looking at swimming schedules in a PDF file produced by the City of Toronto. I found a simple cut and paste error, which a good editor would have corrected.
Maybe the city thinks that is too trivial to worry about. Most people will figure out Glebeholme BoulevarRoad. But they will be embarrassed over the next error—and they might spend money to make sure there are no more like it in their catalogs.
Look for places where your potential clients have something that hurts them; then offer them a solution.