Clarified notes in 3.2 Creating the Blog Application

Changed descriptino of Gemfile to add reference to Bundler
Changed description of README to add 'You should edit ...'
Changed description of Rakefile to reflect dynamic nature of Rakefile
and point to app/lib/tasks/ as the place to add app-specific rake tasks.

railties/guides/source/getting_started.textile

@@ -174,9 +174,9 @@ $ cd blog
 In any case, Rails will create a folder in your working directory called <tt>blog</tt>. Open up that folder and explore its contents. Most of the work in this tutorial will happen in the <tt>app/</tt> folder, but here's a basic rundown on the function of each folder that Rails creates in a new application by default:
 
 |_.File/Folder|_.Purpose|
-|Gemfile|This file allows you to specify what gem dependencies are needed for your Rails application.|
-|README|This is a brief instruction manual for your application. Use it to tell others what your application does, how to set it up, and so on.|
-|Rakefile|This file contains batch jobs that can be run from the terminal.|
+|Gemfile|This file allows you to specify what gem dependencies are needed for your Rails application. See section on Bundler, below.|
+|README|This is a brief instruction manual for your application. You should edit this file to tell others what your application does, how to set it up, and so on.|
+|Rakefile|This file locates and loads tasks that can be run from the command line. The task definitions are defined throughout the components of Rails. Rather than changing Rakefile, you should add your own tasks by adding files to the lib/tasks directory of your application.|
 |app/|Contains the controllers, models, views and assets for your application. You'll focus on this folder for the remainder of this guide.|
 |config/|Configure your application's runtime rules, routes, database, and more.|
 |config.ru|Rack configuration for Rack based servers used to start the application.|