* display.texi (Displaying Messages): Add anchor.

* frames.texi (Dialog Boxes): Use it.

lispref/display.texi

@@ -279,6 +279,7 @@ You can force use of the mouse or of the echo area by binding
 @end defun
 
 @defun message-box format-string &rest arguments
+@anchor{message-box}
 This function displays a message like @code{message}, but uses a dialog
 box (or a pop-up menu) whenever that is possible.  If it is impossible
 to use a dialog box or pop-up menu, because the terminal does not

lispref/frames.texi

@@ -1557,7 +1557,7 @@ window don't matter; only the frame matters.
 
 If @var{header} is non-@code{nil}, the frame title for the box is
 @samp{Information}, otherwise it is @samp{Question}.  The former is used
-for @code{message-box} (@pxref{The Echo Area}).
+for @code{message-box} (@pxref{message-box}).
 
 In some configurations, Emacs cannot display a real dialog box; so
 instead it displays the same items in a pop-up menu in the center of the