[gtk+] docs: Expand icon-palette example

[Matthias Clasen <matthiasc src gnome org>]

commit c501867192b4557c7b629742d1d0f8fe74db5f71
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Oct 21 11:08:07 2016 -0400

    docs: Expand icon-palette example
    
    Add a warning color, and show that hex colors work here.

 docs/reference/gtk/css-overview.xml |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/docs/reference/gtk/css-overview.xml b/docs/reference/gtk/css-overview.xml
index d77fadb..54722ae 100644
--- a/docs/reference/gtk/css-overview.xml
+++ b/docs/reference/gtk/css-overview.xml
@@ -824,7 +824,7 @@ label {
       <programlisting><![CDATA[
 spinner {
   -gtk-icon-source: -gtk-icontheme('process-working-symbolic');
-  -gtk-icon-palette: success blue, error magenta;
+  -gtk-icon-palette: success blue, warning #fc3, error magenta;
 }
 arrow.fancy {
   -gtk-icon-source: -gtk-icontheme('pan-down');