Adds title and basic description where needed.

activerecord/lib/active_record/aggregations.rb

 module ActiveRecord
+  # = Active Record Aggregations
   module Aggregations # :nodoc:
     extend ActiveSupport::Concern
 

activerecord/lib/active_record/attribute_methods.rb

 require 'active_support/core_ext/enumerable'
 
 module ActiveRecord
+  # = Active Record Attribute Methods
   module AttributeMethods #:nodoc:
     extend ActiveSupport::Concern
     include ActiveModel::AttributeMethods

activerecord/lib/active_record/autosave_association.rb

 require 'active_support/core_ext/array/wrap'
 
 module ActiveRecord
+  # = Active Record Autosave Association
+  # 
   # AutosaveAssociation is a module that takes care of automatically saving
   # your associations when the parent is saved. In addition to saving, it
   # also destroys any associations that were marked for destruction.

activerecord/lib/active_record/base.rb

@@ -21,6 +21,8 @@
 require 'active_record/errors'
 
 module ActiveRecord #:nodoc:
+  # = Active Record 
+  #
   # Active Record objects don't specify their attributes directly, but rather infer them from the table definition with
   # which they're linked. Adding, removing, and changing attributes and their type is done directly in the database. Any change
   # is instantly reflected in the Active Record objects. The mapping that binds a given Active Record class to a certain

activerecord/lib/active_record/callbacks.rb

 require 'active_support/core_ext/array/wrap'
 
 module ActiveRecord
+  # = Active Record Callbacks
+  # 
   # Callbacks are hooks into the lifecycle of an Active Record object that allow you to trigger logic
   # before or after an alteration of the object state. This can be used to make sure that associated and
   # dependent objects are deleted when +destroy+ is called (by overwriting +before_destroy+) or to massage attributes

activerecord/lib/active_record/counter_cache.rb

 module ActiveRecord
+  # = Active Record Counter Cache
   module CounterCache
     # Resets one or more counter caches to their correct value using an SQL
     # count query.  This is useful when adding new counter caches, or if the

activerecord/lib/active_record/dynamic_finder_match.rb

 module ActiveRecord
+  # = Active Record Dynamic Finder Match
+  # 
+  # Provides dynamic attribute-based finders such as find_by_country if, for 
+  # example, the Person has an attribute with that name. 
   class DynamicFinderMatch
     def self.match(method)
       df_match = self.new(method)