eliminate repetition in guide links for past releases [ci skip]

guides/source/_welcome.html.erb

@@ -15,14 +15,5 @@
 </p>
 <% end %>
 <p>
-  The guides for Rails 4.1.x are available at <a href="http://guides.rubyonrails.org/v4.1.0/">http://guides.rubyonrails.org/v4.1.0/</a>.
-</p>
-<p>
-  The guides for Rails 4.0.x are available at <a href="http://guides.rubyonrails.org/v4.0.4/">http://guides.rubyonrails.org/v4.0.4/</a>.
-</p>
-<p>
-  The guides for Rails 3.2.x are available at <a href="http://guides.rubyonrails.org/v3.2.17/">http://guides.rubyonrails.org/v3.2.17/</a>.
-</p>
-<p>
-  The guides for Rails 2.3.x are available at <a href="http://guides.rubyonrails.org/v2.3.11/">http://guides.rubyonrails.org/v2.3.11/</a>.
+  The guides for earlier releases: <a href="http://guides.rubyonrails.org/v4.1.0/">Rails 4.1.0</a>, <a href="http://guides.rubyonrails.org/v4.0.4/">Rails 4.0.4</a>, <a href="http://guides.rubyonrails.org/v3.2.17/">Rails 3.2.17</a> and <a href="http://guides.rubyonrails.org/v2.3.11/">Rails 2.3.11</a>.
 </p>