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).
diff --git a/docs/code-style.rst b/docs/code-style.rst
index 8f40ba4..a5a509a 100644
--- a/docs/code-style.rst
+++ b/docs/code-style.rst
@@ -1021,7 +1021,7 @@
     always start with an upper case letter and end with a period.
 
     However, method and class documentation comments should use ``/** */`` style for
-    Doxygen, JavaDoc and JSDoc.
+    Doxygen, JavaDoc and JSDoc. License boilerplate should use ``/* */`` style.
 
 3.26. Comments should be included relative to their position in the code.