[gtk/gtk-3-24] Add a few placeholder documentation block to have g-i annotations

[Rico Tzschichholz <ricotz src gnome org>]

commit c860a2db85072695bbc6e8b0ffbfff6873bf503c
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Wed May 1 15:06:15 2019 +0200

    Add a few placeholder documentation block to have g-i annotations

 gtk/a11y/gtkcellaccessibleparent.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
---
diff --git a/gtk/a11y/gtkcellaccessibleparent.c b/gtk/a11y/gtkcellaccessibleparent.c
index 7bc06a5274..bb0590c1ee 100644
--- a/gtk/a11y/gtkcellaccessibleparent.c
+++ b/gtk/a11y/gtkcellaccessibleparent.c
@@ -42,6 +42,13 @@ gtk_cell_accessible_parent_get_type (void)
   return g_define_type_id__volatile;
 }
 
+/**
+ * gtk_cell_accessible_parent_get_cell_extents:
+ * @x: (out):
+ * @y: (out):
+ * @width: (out):
+ * @height: (out):
+ */
 void
 gtk_cell_accessible_parent_get_cell_extents (GtkCellAccessibleParent *parent,
                                              GtkCellAccessible       *cell,
@@ -61,6 +68,10 @@ gtk_cell_accessible_parent_get_cell_extents (GtkCellAccessibleParent *parent,
     (iface->get_cell_extents) (parent, cell, x, y, width, height, coord_type);
 }
 
+/**
+ * gtk_cell_accessible_parent_get_cell_area:
+ * @cell_rect: (out):
+ */
 void
 gtk_cell_accessible_parent_get_cell_area (GtkCellAccessibleParent *parent,
                                           GtkCellAccessible       *cell,
@@ -188,6 +199,11 @@ gtk_cell_accessible_parent_update_relationset (GtkCellAccessibleParent *parent,
     (iface->update_relationset) (parent, cell, relationset);
 }
 
+/**
+ * gtk_cell_accessible_parent_get_cell_position:
+ * @row: (out):
+ * @column: (out):
+ */
 void
 gtk_cell_accessible_parent_get_cell_position (GtkCellAccessibleParent *parent,
                                               GtkCellAccessible       *cell,