Fixed non-working around callback example

activesupport/lib/active_support/callbacks.rb

@@ -367,7 +367,7 @@ def __update_callbacks(name, filters = [], block = nil) #:nodoc:
       #
       #   set_callback :save, :before, :before_meth
       #   set_callback :save, :after,  :after_meth, :if => :condition
-      #   set_callback :save, :around, lambda { |r| stuff; result = yield; stuff }
+      #   set_callback :save, :around, lambda { |r, &block| stuff; result = block.call; stuff }
       #
       # The second arguments indicates whether the callback is to be run +:before+,
       # +:after+, or +:around+ the event. If omitted, +:before+ is assumed. This