[gtk+] docs: css-properties: Fix wrongly repeated colour

[Daniel Boles <dboles src gnome org>]

commit 29d40196e62cdc5961af2e35eda7edeb3747beff
Author: Daniel Boles <dboles src gnome org>
Date:   Fri Sep 29 18:13:44 2017 +0100

    docs: css-properties: Fix wrongly repeated colour

 docs/reference/gtk/css-properties.xml |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/docs/reference/gtk/css-properties.xml b/docs/reference/gtk/css-properties.xml
index c3f4630..b7cb972 100644
--- a/docs/reference/gtk/css-properties.xml
+++ b/docs/reference/gtk/css-properties.xml
@@ -509,7 +509,7 @@ We use <literallayout> for syntax productions, and each line is put in a <code>
         icons. The recognized names for colors in symbolic icons are error,
         warning and success. The default palette maps these three names to
         symbolic colors with the names @error_color, @warning_color and
-        @error_color.
+        @success_color respectively.
       </para>
 
       <table pgwide="1">