use new AR calls in examples

activesupport/lib/active_support/core_ext/array/conversions.rb

@@ -37,12 +37,12 @@ def to_sentence(options = {})
   # Converts a collection of elements into a formatted string by calling
   # <tt>to_s</tt> on all elements and joining them:
   #
-  #   Blog.find(:all).to_formatted_s # => "First PostSecond PostThird Post"
+  #   Blog.all.to_formatted_s # => "First PostSecond PostThird Post"
   #
   # Adding in the <tt>:db</tt> argument as the format yields a prettier
   # output:
   #
-  #   Blog.find(:all).to_formatted_s(:db) # => "First Post,Second Post,Third Post"
+  #   Blog.all.to_formatted_s(:db) # => "First Post,Second Post,Third Post"
   def to_formatted_s(format = :default)
     case format
       when :db