Add two missing Since markers

gsk/gskrendernodeimpl.c

@@ -1588,6 +1588,8 @@ gsk_texture_node_new (GdkTexture            *texture,
  * GskTextureScaleNode:
  *
  * A render node for a `GdkTexture`.
+ *
+ * Since: 4.10
  */
 struct _GskTextureScaleNode
 {

gtk/gtkaccessible.c

@@ -89,6 +89,8 @@ gtk_accessible_default_init (GtkAccessibleInterface *iface)
  * Retrieves the `GtkATContext` for the given `GtkAccessible`.
  *
  * Returns: (transfer none): the `GtkATContext`
+ *
+ * Since: 4.10
  */
 GtkATContext *
 gtk_accessible_get_at_context (GtkAccessible *self)