Debug output should display dist path (clarify v4/Typescript/main)

Examples I've seen and the vscode extension for v4 Azure Functions for node.js don't follow best practices. They dump src files under dist (dist/src/functions; it should be dist/functions). I spent too much time trying to figure out what was wrong after I made a minor best practices change to my repo.. A simple message from `func --verbose` telling me where it was looking for files would save other people this kind of trouble.