[gtk/matthiasc/for-master] docs: Remove mentions of <accelerator>

[Matthias Clasen <matthiasc src gnome org>]

commit ab9e99218f8c5877b52b5eb61822ddb882294e8b
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Dec 2 19:59:44 2020 -0500

    docs: Remove mentions of <accelerator>
    
    That is no longer supported, keyboard shortcuts
    are done with GtkShortcut now.
    
    Fixes: #3429

 gtk/gtkbuildable.h |  4 ++--
 gtk/gtkwidget.c    | 11 ++---------
 2 files changed, 4 insertions(+), 11 deletions(-)
---
diff --git a/gtk/gtkbuildable.h b/gtk/gtkbuildable.h
index 058845caba..b446b570b9 100644
--- a/gtk/gtkbuildable.h
+++ b/gtk/gtkbuildable.h
@@ -110,8 +110,8 @@ struct _GtkBuildableParser
  * @custom_tag_start: Implement this if the buildable needs to parse
  *  content below <child>. To handle an element, the implementation
  *  must fill in the @parser and @user_data and return %TRUE.
- *  #GtkWidget implements this to parse keyboard accelerators specified
- *  in <accelerator> elements.
+ *  #GtkWidget implements this to parse accessible attributes specified
+ *  in <accessibility> elements.
  *  Note that @user_data must be freed in @custom_tag_end or @custom_finished.
  * @custom_tag_end: Called for the end tag of each custom element that is
  *  handled by the buildable (see @custom_tag_start).
diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index f649acfe74..ab9de00cd2 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -249,15 +249,8 @@
  * # GtkWidget as GtkBuildable
  *
  * The GtkWidget implementation of the #GtkBuildable interface supports a
- * custom `<accelerator>` element, which has attributes named ”key”, ”modifiers”
- * and ”signal” and allows to specify accelerators.
- *
- * An example of a UI definition fragment specifying an accelerator:
- * |[
- * <object class="GtkButton">
- *   <accelerator key="q" modifiers="GDK_CONTROL_MASK" signal="clicked"/>
- * </object>
- * ]|
+ * custom elements to specify various aspects of widgets that are not
+ * directly expressed as properties.
  *
  * If the parent widget uses a #GtkLayoutManager, #GtkWidget supports a
  * custom `<layout>` element, used to define layout properties: