Fix Active Record README formatting [ci-skip]

This fixes the indentation of the example code of the first bullet
point. The "Learn more" link was moved to the bottom of the bullet point,
similar to the other bullet points.

Author: p8

activerecord/README.rdoc

@@ -19,23 +19,22 @@ A short rundown of some of the major features:
 
 * Automated mapping between classes and tables, attributes and columns.
 
-   class Product < ActiveRecord::Base
-   end
-
-  {Learn more}[link:classes/ActiveRecord/Base.html]
+    class Product < ActiveRecord::Base
+    end
 
-The Product class is automatically mapped to the table named "products",
-which might look like this:
+  The Product class is automatically mapped to the table named "products",
+  which might look like this:
 
-   CREATE TABLE products (
-     id bigint NOT NULL auto_increment,
-     name varchar(255),
-     PRIMARY KEY  (id)
-   );
+    CREATE TABLE products (
+      id bigint NOT NULL auto_increment,
+      name varchar(255),
+      PRIMARY KEY  (id)
+    );
 
-This would also define the following accessors: <tt>Product#name</tt> and
-<tt>Product#name=(new_name)</tt>.
+  This would also define the following accessors: <tt>Product#name</tt> and
+  <tt>Product#name=(new_name)</tt>.
 
+  {Learn more}[link:classes/ActiveRecord/Base.html]
 
 * Associations between objects defined by simple class methods.