[gtk/wip/dboles/scrolledwindow-annotations: 1/2] ScrolledWindow: Replace deprecated (allow-none)

[Daniel Boles <dboles src gnome org>]

commit 45a98d6a938eb0e6184af44d44f0bcc1fb5aab96
Author: Daniel Boles <dboles src gmail com>
Date:   Tue May 21 20:25:54 2019 +0100

    ScrolledWindow: Replace deprecated (allow-none)
    
    We prefer (nullable) for in arguments and (optional) for out arguments
    that can be passed as NULL to avoid assigning anything to them.

 gtk/gtkscrolledwindow.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/gtk/gtkscrolledwindow.c b/gtk/gtkscrolledwindow.c
index 2ba312e741..1a1c03b4ae 100644
--- a/gtk/gtkscrolledwindow.c
+++ b/gtk/gtkscrolledwindow.c
@@ -1997,8 +1997,8 @@ gtk_scrolled_window_init (GtkScrolledWindow *scrolled_window)
 
 /**
  * gtk_scrolled_window_new:
- * @hadjustment: (allow-none): horizontal adjustment
- * @vadjustment: (allow-none): vertical adjustment
+ * @hadjustment: (nullable): horizontal adjustment
+ * @vadjustment: (nullable): vertical adjustment
  *
  * Creates a new scrolled window.
  *
@@ -2293,9 +2293,9 @@ gtk_scrolled_window_set_policy (GtkScrolledWindow *scrolled_window,
 /**
  * gtk_scrolled_window_get_policy:
  * @scrolled_window: a #GtkScrolledWindow
- * @hscrollbar_policy: (out) (allow-none): location to store the policy 
+ * @hscrollbar_policy: (out) (optional): location to store the policy
  *     for the horizontal scrollbar, or %NULL
- * @vscrollbar_policy: (out) (allow-none): location to store the policy
+ * @vscrollbar_policy: (out) (optional): location to store the policy
  *     for the vertical scrollbar, or %NULL
  * 
  * Retrieves the current policy values for the horizontal and vertical