[gtk+] GtkBindings: Fix CSS key in example docs

[Matthias Clasen <matthiasc src gnome org>]

commit 6df8bc2e1a4f7511f4f9a468b321d618ad82cb18
Author: Felix Riemann <friemann gnome org>
Date:   Sat Jan 2 21:28:51 2016 +0100

    GtkBindings: Fix CSS key in example docs
    
    gtk-key-bindings was renamed to -gtk-key-bindings in d267b8e0.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=760082

 gtk/gtkbindings.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/gtk/gtkbindings.c b/gtk/gtkbindings.c
index ac45da2..39973e7 100644
--- a/gtk/gtkbindings.c
+++ b/gtk/gtkbindings.c
@@ -77,7 +77,7 @@
  * }
  * GtkEntry
  * {
- *   gtk-key-bindings: MoveCursor3;
+ *   -gtk-key-bindings: MoveCursor3;
  * }
  * ]|
  *
@@ -99,7 +99,7 @@
  * }
  * GtkEntry
  * {
- *   gtk-key-bindings: MoveCursor3;
+ *   -gtk-key-bindings: MoveCursor3;
  * }
  * ]|
  *
@@ -122,7 +122,7 @@
  * }
  * GtkEntry
  * {
- *   gtk-key-bindings: MoveCursor3;
+ *   -gtk-key-bindings: MoveCursor3;
  * }
  * ]|
  *