[gtk+] docs: Add missing signal parameter

[Emmanuele Bassi <ebassi src gnome org>]

commit f27dd8834bb658b5c4088f33a1b9fd2e78b703f6
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Thu Dec 21 19:00:28 2017 +0000

    docs: Add missing signal parameter
    
    The `flags` parameter is missing, and the introspection scanner is
    complaining about it.

 gtk/gtkplacessidebar.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkplacessidebar.c b/gtk/gtkplacessidebar.c
index 326a05c..b7a6d91 100644
--- a/gtk/gtkplacessidebar.c
+++ b/gtk/gtkplacessidebar.c
@@ -4659,7 +4659,8 @@ gtk_places_sidebar_class_init (GtkPlacesSidebarClass *class)
 
   /**
    * GtkPlacesSidebar::show-starred-location:
-   * @sidebar: the object which received the signal.
+   * @sidebar: the object which received the signal
+   * @flags: the flags for the operation
    *
    * The places sidebar emits this signal when it needs the calling
    * application to present a way to show the starred files. In GNOME,