remove Id keyword.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@22304 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/time.rb

@@ -35,10 +35,6 @@
 #   %z is required to generate zone in date-time of RFC 2822
 #   but it is not portable.
 #
-# == Revision Information
-#
-# $Id$
-#
 
 require 'date/format'