Prefix argument says to turn mode on if positive, off if negative.
When the mode is turned on, if there are newlines in the buffer but no hard
-newlines, ask the user whether to mark as hard any newlines preceeding a
+newlines, ask the user whether to mark as hard any newlines preceding a
`paragraph-start' line. From a program, second arg INSERT specifies whether
to do this; it can be `never' to change nothing, t or `always' to force
marking, `guess' to try to do the right thing with no questions, nil