[gtk] contentserializer: Fix an annotation

[Matthias Clasen <matthiasc src gnome org>]

commit 21708e43529376da99d4f7d4a7e6802f8b04af1e
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Dec 30 21:13:27 2019 -0500

    contentserializer: Fix an annotation

 gdk/gdkcontentserializer.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gdk/gdkcontentserializer.c b/gdk/gdkcontentserializer.c
index 592a7a9428..b78818a75f 100644
--- a/gdk/gdkcontentserializer.c
+++ b/gdk/gdkcontentserializer.c
@@ -432,7 +432,7 @@ lookup_serializer (const char *mime_type,
 
 /**
  * gdk_content_formats_union_serialize_gtypes:
- * @formats: a #GdkContentFormats
+ * @formats: (transfer full): a #GdkContentFormats
  *
  * Add GTypes for the mime types in @formats for which serializers are
  * registered.
@@ -467,7 +467,7 @@ gdk_content_formats_union_serialize_gtypes (GdkContentFormats *formats)
 
 /**
  * gdk_content_formats_union_serialize_mime_types:
- * @formats: a #GdkContentFormats
+ * @formats: (transfer full):  a #GdkContentFormats
  *
  * Add mime types for GTypes in @formats for which serializers are
  * registered.