added value and notes to a sample config file for s3token
added value and notes to a sample config file for s3token

Change-Id: I18accffb2cf6ba6a3fff6fd5d95f06a424d1d919

tipabu/swift,tipabu/swift,openstack/swift,openstack/swift,swiftstack/swift,openstack/swift,tipabu/swift,tipabu/swift,openstack/swift,swiftstack/swift,swiftstack/swift