[gtk+] docs: Remove mention of GdkColor

[Benjamin Otte <otte src gnome org>]

commit 2ae6f59e7a0fb3b4af79f39d8d29e49e009133c2
Author: Benjamin Otte <otte redhat com>
Date:   Tue Jan 17 20:59:19 2017 +0100

    docs: Remove mention of GdkColor

 gdk/gdkcairo.c |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)
---
diff --git a/gdk/gdkcairo.c b/gdk/gdkcairo.c
index 0846203..83cdac3 100644
--- a/gdk/gdkcairo.c
+++ b/gdk/gdkcairo.c
@@ -34,9 +34,8 @@
  *
  * GDK does not wrap the cairo API, instead it allows to create cairo
  * contexts which can be used to draw on #GdkWindows. Additional
- * functions allow use #GdkRectangles with cairo and to use #GdkColors,
- * #GdkRGBAs, #GdkPixbufs and #GdkWindows as sources for drawing
- * operations.
+ * functions allow use #GdkRectangles with cairo and to use #GdkRGBAs,
+ * #GdkPixbufs and #GdkWindows as sources for drawing operations.
  */