[gtk] gtk: Fix parameter annotations for gtk_buildable_parse_context_get_position

[Rico Tzschichholz <ricotz src gnome org>]

commit 67bd28eaafa3be852b15904dbf890b1151524800
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Sun Sep 15 17:31:41 2019 +0200

    gtk: Fix parameter annotations for gtk_buildable_parse_context_get_position

 gtk/gtkbuilderparser.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtkbuilderparser.c b/gtk/gtkbuilderparser.c
index 40629104ae..b2a23c1aba 100644
--- a/gtk/gtkbuilderparser.c
+++ b/gtk/gtkbuilderparser.c
@@ -332,8 +332,8 @@ gtk_buildable_parse_context_get_element_stack (GtkBuildableParseContext *context
 /**
  * gtk_buildable_parse_context_get_position:
  * @context: a #GtkBuildableParseContext
- * @line_number: (nullable): return location for a line number, or %NULL
- * @char_number: (nullable): return location for a char-on-line number, or %NULL
+ * @line_number: (out) (optional): return location for a line number, or %NULL
+ * @char_number: (out) (optional): return location for a char-on-line number, or %NULL
  *
  * Retrieves the current line number and the number of the character on
  * that line. Intended for use in error messages; there are no strict