Revert "Whitespace trimming in guides generation"

This reverts commit 91a1cf70.

Reason: code changes disallowed in docrails, even if they are
guides generation related.

guides/source/credits.html.erb

@@ -32,8 +32,8 @@ Ruby on Rails Guides: Credits
 <% end %>
 
 <%= author('Oscar Del Ben', 'oscardelben', 'oscardelben.jpg') do %>
-  Oscar Del Ben is a software engineer at <a href="http://www.wildfireapp.com/">Wildfire</a>. He's a regular open source contributor (<a href="https://github.com/oscardelben">GitHub account</a>) and tweets regularly at <a href="https://twitter.com/oscardelben">@oscardelben</a>.
-<% end %>
+Oscar Del Ben is a software engineer at <a href="http://www.wildfireapp.com/">Wildfire</a>. He's a regular open source contributor (<a href="https://github.com/oscardelben">GitHub account</a>) and tweets regularly at <a href="https://twitter.com/oscardelben">@oscardelben</a>.
+  <% end %>
 
 <%= author('Frederick Cheung', 'fcheung') do %>
   Frederick Cheung is Chief Wizard at Texperts where he has been using Rails since 2006. He is based in Cambridge (UK) and when not consuming fine ales he blogs at <a href="http://www.spacevatican.org">spacevatican.org</a>.