use the same amount of left indent in all code blocks of README.rdoc

Author: fxn

README.rdoc

@@ -30,7 +30,7 @@ link:files/vendor/rails/actionpack/README.html.
 
 1. Install Rails at the command prompt if you haven't yet:
 
-     gem install rails
+    gem install rails
 
 2. At the command prompt, create a new Rails application:
 
@@ -46,7 +46,7 @@ link:files/vendor/rails/actionpack/README.html.
 
 4. Go to http://localhost:3000/ and you'll see:
 
-     "Welcome aboard: You're riding Ruby on Rails!"
+    "Welcome aboard: You're riding Ruby on Rails!"
 
 5. Follow the guidelines to start developing your application. You can find 
 the following resources handy: