Changeing some code-styles of the examples & fix a typo on dependent option

activerecord/lib/active_record/callbacks.rb

@@ -204,43 +204,37 @@ module ActiveRecord
   #
   # Sometimes the code needs that the callbacks execute in a specific order. For example, a +before_destroy+
   # callback (log_children in this case) should be executed before the children get destroyed by the
-  # dependant destroy option.
+  # dependent destroy option.
   #
   # Let's take at the code below:
   #
   #   class Topic < ActiveRecord::Base
-  #
-  #     has_many :children, dependant: destroy
+  #     has_many :children, dependent: destroy
   #
   #     before_destroy :log_children
   #
-  #     def log_children
-  #       children.each do |child|
-  #         # Some child processing
+  #     private
+  #       def log_children
+  #         # Child processing
   #       end
-  #     end
-  #
   #   end
   #
   # In this case the problem is that when the +before_destroy+ is executed, the children are not available
-  # because the dependant destroy gets executed first. To solve this issue it is possible
-  # to use the +prepend+ option on the +before_destroy+ callback.
+  # because the dependent destroy gets executed first. To solve this issue it is possible to use the
+  # +prepend+ option on the +before_destroy+ callback.
   #
   #   class Topic < ActiveRecord::Base
-  #
-  #     has_many :children, dependant: destroy
+  #     has_many :children, dependent: destroy
   #
   #     before_destroy :log_children, prepend: true
   #
-  #     def log_children
-  #       children.each do |child|
-  #         # Some child processing
+  #     private
+  #       def log_children
+  #         # Child processing
   #       end
-  #     end
-  #
   #   end
   #
-  # This way, the +before_destroy+ gets executed before the <tt>dependant: destroy</tt> is called, and
+  # This way, the +before_destroy+ gets executed before the <tt>dependent: destroy</tt> is called, and
   # the data is still available.
   #
   # == Transactions