Remove incorrect licensing information.

Signed-off-by: Jeff Scheel <scheel@us.ibm.com>

specification/ch_preface.xml

@@ -1,20 +1,4 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<!--
-  Copyright (c) 2016 OpenPOWER Foundation
-  
-  Licensed under the Apache License, Version 2.0 (the "License");
-  you may not use this file except in compliance with the License.
-  You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-  Unless required by applicable law or agreed to in writing, software
-  distributed under the License is distributed on an "AS IS" BASIS,
-  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  See the License for the specific language governing permissions and
-  limitations under the License.
-  
--->
 <preface xmlns="http://docbook.org/ns/docbook"
   xmlns:xi="http://www.w3.org/2001/XInclude"
   xmlns:xlink="http://www.w3.org/1999/xlink"