Correcting ActiveRecord::Core#encode_with docs

activerecord/lib/active_record/core.rb

@@ -243,7 +243,7 @@ def initialize_dup(other)
     #   end
     #   coder = {}
     #   Post.new.encode_with(coder)
-    #   coder # => { 'id' => nil, ... }
+    #   coder # => {"attributes" => {"id" => nil, ... }}
     def encode_with(coder)
       coder['attributes'] = attributes
     end