bug#37508: Incorrect reference inelisp manual

[Eli Zaretskii]

> From: Juanma Barranquero <lekktu@gmail.com>
> Date: Wed, 25 Sep 2019 03:28:45 +0200
> Cc: 37508-done@debbugs.gnu.org
> 
> > In modes.texi, @ref{%-Constructs} should be @ref{Constructs}.
> 
> That section talks about the "%" constructs used as placeholders in the 
> modeline, that are replaced by useful
> information (buffer name, column, etc.). They are similar to % formats in C's 
> printf().
> 
> So %-Constructs is correct.

100% agreement.  I checked what this reference does in the manual, and
it gets me to the right node.