Pepper: Add copyright info to doc shell scripts.

ppapi/c/documentation/check.sh

 #!/bin/bash
+# Copyright (c) 2013 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
 
 # simple script to check html via tidy. Either specify html files on
 # command line or rely on default which checks all html files in
 # current directory
 set -o nounset
 set -o errexit
 
 
 CheckFile () {
   echo "========================================"
   echo "checking $1"
   echo "========================================"
   tidy -e -q $1
 }
 
 
 if [ $# -eq 0  ] ; then
   for file in *.html ; do
    CheckFile ${file}
   done
 else
   for file in $* ; do
    CheckFile ${file}
   done
 fi