[gtk+] label: Remove extra quote in code example

[Daniel Boles <dboles src gnome org>]

commit 29ff3c072c61ce227a4b16840282293d74211a35
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 950b286..2e0dd59 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>
  * ]|