* doc/lispref/display.texi (Selective Display): Declare it deprecated

doc/lispref/display.texi

@@ -1034,8 +1034,8 @@ hiding certain lines on the screen.
 @cindex explicit selective display
   The first variant, explicit selective display, was designed for use in a Lisp
 program: it controls which lines are hidden by altering the text.  This kind of
-hiding is now obsolete; instead you can get the same effect with the
-@code{invisible} property (@pxref{Invisible Text}).
+hiding is now obsolete and deprecated; instead you should use the
+@code{invisible} property (@pxref{Invisible Text}) to get the same effect.
 
   In the second variant, the choice of lines to hide is made
 automatically based on indentation.  This variant is designed to be a