[glibmm] Gio::ActionMap: Clarify doc of ActivateWithParameterSlot

[Daniel Boles <dboles src gnome org>]

commit aa40819c5b7b8cd6e0e29ebe14efdc76d20d437f
Author: Daniel Boles <dboles src gnome org>
Date:   Sat Dec 24 14:44:41 2016 +0000

    Gio::ActionMap: Clarify doc of ActivateWithParameterSlot
    
    This brings it in line with the existing doc comment for ActivateSlot.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=774444

 gio/src/actionmap.hg |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/gio/src/actionmap.hg b/gio/src/actionmap.hg
index 8128037..40dd6b9 100644
--- a/gio/src/actionmap.hg
+++ b/gio/src/actionmap.hg
@@ -49,7 +49,8 @@ public:
   _WRAP_METHOD(Glib::RefPtr<Action> lookup_action(const Glib::ustring& action_name), 
g_action_map_lookup_action, refreturn)
   _WRAP_METHOD(Glib::RefPtr<const Action> lookup_action(const Glib::ustring& action_name) const, 
g_action_map_lookup_action, constversion, refreturn)
 
-  /** A Slot to be called when an action has been activated.
+  /** A Slot to be called when an action has been activated,
+   * passing a parameter of a specified type.
    * See add_action_with_parameter().
    *
    * For instance,