- "Toggle Auto-insert mode.
-With prefix ARG, turn Auto-insert mode on if and only if ARG is positive.
-Returns the new status of Auto-insert mode (non-nil means on).
+ "Toggle Auto-insert mode, a global minor mode.
+With a prefix argument ARG, enable Auto-insert mode if ARG is
+positive, and disable it otherwise. If called from Lisp, enable
+the mode if ARG is omitted or nil.