updating documentation about lazy hooks in ActiveSupport

railties/guides/source/initialization.textile

@@ -258,28 +258,23 @@ This file goes on to define some classes that will be automatically loaded using
 
 h4. Lazy Hooks
 
-At the top if the +ActiveSupport::Autoload+ module is the +def self.extended+ method:
-
-<ruby>
-  def self.extended(base)
-     base.extend(LazyLoadHooks)
-   end
-</ruby>
-
-This is called when we extend this module into one of our classes or modules, such is the case later on when we call +extend ActiveSupport::LazyLoadHooks+ not only in the +ActiveSupport+ module, but in all of the Railtie modules (+ActiveRecord+ and so on), as well as in a couple of places.
-
 +ActiveSupport::LazyLoadHooks+ is responsible for defining methods used for running hooks that are defined during the initialization process, such as the one defined inside the +active_record.initialize_timezone+ initializer:
 
 <ruby>
   initializer "active_record.initialize_timezone" do
-    ActiveRecord.base_hook do
+    ActiveSupport.on_load(:active_record) do
       self.time_zone_aware_attributes = true
       self.default_timezone = :utc
     end
   end
 </ruby>
 
-When the initializer is ran it defines a +base_hook+ for +ActiveRecord+ and will only run it when +run_base_hooks+ is called, which in the case of Active Record, is ran after the entirety of +activerecord/lib/active_record/base.rb+ has been evaluated.
+When the initializer runs it invokes method +on_load+ for +ActiveRecord+ and the block passed to it would be called only when +run_load_hooks+ is called.
+When the entirety of +activerecord/lib/active_record/base.rb+ has been evaluated then +run_load_hooks+ is invoked. The very last line of +activerecord/lib/active_record/base.rb+ is:
+
+<ruby>
+ActiveSupport.run_load_hooks(:active_record, ActiveRecord::Base)
+</ruby>
 
 h4. +require 'active_support'+ cont'd.