[glibmm] Gio::ActionMap: Add function to ActivateSlot doc

[Daniel Boles <dboles src gnome org>]

commit 2bb9c26b88388535decbd9fb0d9a069d0f877725
Author: Daniel Boles <dboles src gnome org>
Date:   Sat Dec 24 14:47:24 2016 +0000

    Gio::ActionMap: Add function to ActivateSlot doc
    
    It's used in add_action_with_bool() too.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=774444

 gio/src/actionmap.hg |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gio/src/actionmap.hg b/gio/src/actionmap.hg
index 40dd6b9..e233620 100644
--- a/gio/src/actionmap.hg
+++ b/gio/src/actionmap.hg
@@ -80,7 +80,7 @@ public:
 
   /** A Slot to be called when an action has been activated,
    * without passing a parameter to the slot.
-   * See add_action().
+   * See add_action() and add_action_bool().
    *
    * For instance,
    * void on_slot_activated();