[gtksourceview] CompletionProvider: add missing GI annotation

[Sébastien Wilmet <swilmet src gnome org>]

commit c6992936323b2f57637ecd18898de84bce164e56
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Sun Jan 4 15:19:18 2015 +0100

    CompletionProvider: add missing GI annotation
    
    https://bugzilla.gnome.org/show_bug.cgi?id=742015

 gtksourceview/gtksourcecompletionprovider.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtksourceview/gtksourcecompletionprovider.c b/gtksourceview/gtksourcecompletionprovider.c
index cba838e..3f1f4f7 100644
--- a/gtksourceview/gtksourcecompletionprovider.c
+++ b/gtksourceview/gtksourcecompletionprovider.c
@@ -291,7 +291,7 @@ gtk_source_completion_provider_update_info (GtkSourceCompletionProvider *provide
  * @provider: a #GtkSourceCompletionProvider.
  * @proposal: a #GtkSourceCompletionProposal.
  * @context: a #GtkSourceCompletionContext.
- * @iter: a #GtkTextIter.
+ * @iter: (out): a #GtkTextIter.
  *
  * Get the #GtkTextIter at which the completion for @proposal starts. When
  * implemented, this information is used to position the completion window