"Toggle ElDoc mode on or off.
In ElDoc mode, the echo area displays information about a
function or variable in the text where point is. If point is
-on a documented variable, it displays that variable's doc string.
-Otherwise it displays the argument list of the function called
-in the expression point is on.
+on a documented variable, it displays the first line of that
+variable's doc string. Otherwise it displays the argument list
+of the function called in the expression point is on.
With prefix ARG, turn ElDoc mode on if and only if ARG is positive."
:group 'eldoc :lighter eldoc-minor-mode-string