Reference current fast_xs URL

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@7774 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activesupport/CHANGELOG

 *SVN*
 
-* String#to_xs uses the fast_xs extension if available for Builder speedup.  [Jeremy Kemper]
+* String#to_xs uses Eric Wong's fast_xs extension, if available, for Builder speedup.  http://bogomips.org/fast_xs/  [Jeremy Kemper]
 
 * Introduce BasicObject as Builder::BlankSlate for Ruby 1.9 forward compatibility.  [Jeremy Kemper]
 

activesupport/lib/active_support/core_ext/string/xchar.rb

 begin
+  # See http://bogomips.org/fast_xs/ by Eric Wong
   require 'fast_xs'
 
   class String