normalizes titles of release notes guides, and adds them to the home page

railties/guides/source/3_0_release_notes.textile

-h2. Rails 3.0: Release Notes
+h2. Ruby on Rails 3.0 Release Notes
 
 Rails 3.0 is ponies and rainbows! It's going to cook you dinner and fold your laundry. You're going to wonder how life was ever possible before it arrived. It's the Best Version of Rails We've Ever Done! 
 

railties/guides/source/index.textile.erb

@@ -120,5 +120,20 @@ h3. Digging Deeper
 <% guide("Contributing to Rails", 'contributing_to_rails.html') do %>
   Rails is not "somebody else's framework." This guide covers a variety of ways that you can get involved in the ongoing development of Rails.
 <% end %>
+</dl>
+
+h3. Release Notes
+
+<dl>
+<% guide("Ruby on Rails 3.0 Release Notes", '3_0_release_notes.html') do %>
+  Release notes for Rails 3.0.
+<% end %>
+
+<% guide("Ruby on Rails 2.3 Release Notes", '2_3_release_notes.html') do %>
+  Release notes for Rails 2.3.
+<% end %>
 
+<% guide("Ruby on Rails 2.2 Release Notes", '2_2_release_notes.html') do %>
+  Release notes for Rails 2.2.
+<% end %>
 </dl>

railties/guides/source/layout.html.erb

@@ -67,6 +67,12 @@
               <dd><a href="caching_with_rails.html">Caching with Rails</a></dd>
               <dd><a href="contributing_to_rails.html">Contributing to Rails</a></dd>
             </dl>
+            <dl class="R">
+              <dt>Release Notes</dt>
+              <dd><a href="3_0_release_notes.html">Ruby on Rails 3.0 Release Notes</a></dd>
+              <dd><a href="2_3_release_notes.html">Ruby on Rails 2.3 Release Notes</a></dd>
+              <dd><a href="2_2_release_notes.html">Ruby on Rails 2.2 Release Notes</a></dd>
+            </dl>
           </div>
         </li>
         <li><a href="contribute.html">Contribute</a></li>