As you can see, after I insert the " * @return <description of return value>" I want to use the fill-paragraph function, just as I would do if I were manually typing the line and using the M-q keybinding. When the fill-parargraph function runs, I get an error message "wrong number of arguments" and a bunch of gibberish. I've tried a bunch of different combinations of things and checked the C-h f help page for the fill-paragraph function, but I'm still stuck.