[gtk+/gtk-3-22] label: Remove extra quote in code example

[Daniel Boles <dboles src gnome org>]

commit c23205dc82142c62f83e7e13eb820d17edd22e2a
Author: Daniel Boles <dboles src gmail com>
Date:   Fri Jul 7 08:13:41 2017 +0100

    label: Remove extra quote in code example

 gtk/gtklabel.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtklabel.c b/gtk/gtklabel.c
index f97e73b..c9de2a5 100644
--- a/gtk/gtklabel.c
+++ b/gtk/gtklabel.c
@@ -108,7 +108,7 @@
  * <object class="GtkLabel">
  *   <attributes>
  *     <attribute name="weight" value="PANGO_WEIGHT_BOLD"/>
- *     <attribute name="background" value="red" start="5" end="10"/>"
+ *     <attribute name="background" value="red" start="5" end="10"/>
  *   </attributes>
  * </object>
  * ]|