[gtk+] gtk-demo: Add font features to markup demo

[Matthias Clasen <matthiasc src gnome org>]

commit 627886c682f834a4b5a7b1c88344200d4ea6d7a3
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Jul 29 18:35:56 2015 -0400

    gtk-demo: Add font features to markup demo

 demos/gtk-demo/markup.txt |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/demos/gtk-demo/markup.txt b/demos/gtk-demo/markup.txt
index a256288..2ad2431 100644
--- a/demos/gtk-demo/markup.txt
+++ b/demos/gtk-demo/markup.txt
@@ -11,4 +11,5 @@ More superscripts: 2<span rise="8000" size="smaller">2<span rise="14000" size="s
 
 <span letter_spacing="3000">Letterspacing</span>
 
+OpenType font features such as ligatures: <span font_desc="sans regular" font_features="dlig=0">feast</span> 
versus <span font_desc="sans regular" font_features="dlig=1">feast</span>
 Shortcuts: <tt>Monospace</tt> – <b>Bold</b> – <i>Italic</i> – <big>Big</big> – <small>Small</small> – 
<u>Underlined</u> – <s>Strikethrough</s> – Super<sup>script</sup> – Sub<sub>script</sub>