Regenerate Gemfile for getting started guide

guides/code/getting_started/Gemfile

 source 'https://rubygems.org'
 
-gem 'rails', '3.2.0'
+gem 'rails', '3.2.3'
 
 # Bundle edge Rails instead:
 # gem 'rails', :git => 'git://github.com/rails/rails.git'
@@ -15,7 +15,7 @@ group :assets do
   gem 'coffee-rails', '~> 3.2.1'
 
   # See https://github.com/sstephenson/execjs#readme for more supported runtimes
-  # gem 'therubyracer'
+  # gem 'therubyracer', :platform => :ruby
 
   gem 'uglifier', '>= 1.0.3'
 end
@@ -28,7 +28,7 @@ gem 'jquery-rails'
 # To use Jbuilder templates for JSON
 # gem 'jbuilder'
 
-# Use unicorn as the web server
+# Use unicorn as the app server
 # gem 'unicorn'
 
 # Deploy with Capistrano