docs: start license boilerplate with /*

refs #4163

Change-Id: I08097e68802a3393494427927c28af58dc7f052b
diff --git a/README-dev.md b/README-dev.md
index 6d6d572..d2cc54a 100644
--- a/README-dev.md
+++ b/README-dev.md
@@ -15,7 +15,7 @@
 
 
     /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
-    /**
+    /*
      * Copyright (c) [Year(s)] [Copyright Holder].
      *
      * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).