Remove trailing whitespace from XML copyright template
diff --git a/docs/copyright-templates/xml.txt b/docs/copyright-templates/xml.txt
index 2a9d2b6..3e94185 100644
--- a/docs/copyright-templates/xml.txt
+++ b/docs/copyright-templates/xml.txt
@@ -4,9 +4,9 @@
      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.