[gtkmm] Gtk::LevelBar: Don't let the copyright text be a Doxygen comment

[Kjell Ahlstedt <kjellahl src gnome org>]

commit a237e40284fcb0f67537173a49b85dab0d416925
Author: Kjell Ahlstedt <kjellahlstedt gmail com>
Date:   Wed Aug 1 10:02:12 2018 +0200

    Gtk::LevelBar: Don't let the copyright text be a Doxygen comment
    
    The copyright and license text started with "/**" which made Doxygen regard
    it as a description of the Gtk namespace.

 gtk/src/levelbar.ccg | 2 +-
 gtk/src/levelbar.hg  | 3 +--
 2 files changed, 2 insertions(+), 3 deletions(-)
---
diff --git a/gtk/src/levelbar.ccg b/gtk/src/levelbar.ccg
index 2d72c03c..5dd82c2f 100644
--- a/gtk/src/levelbar.ccg
+++ b/gtk/src/levelbar.ccg
@@ -1,4 +1,4 @@
-/** Copyright (C) 2012 The gtkmm Development Team
+/* Copyright (C) 2012 The gtkmm Development Team
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
diff --git a/gtk/src/levelbar.hg b/gtk/src/levelbar.hg
index db9d3bce..9c14b447 100644
--- a/gtk/src/levelbar.hg
+++ b/gtk/src/levelbar.hg
@@ -1,5 +1,4 @@
-/**
- * Copyright (C) 2012 The gtkmm Development Team
+/* Copyright (C) 2012 The gtkmm Development Team
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public