Revert "Added 'Rails Guides Reviewers' section to credits"

The credits page mentions the doc team and guide authors.

This reverts commit be72a39.

railties/guides/source/credits.html.erb

@@ -59,8 +59,6 @@
   Mikel Lindsaar has been working with Rails since 2006 and is the author of the Ruby Mail gem and core contributor (he helped re-write Action Mailer's API). Mikel has a <a href="http://lindsaar.net/">blog</a> and <a href="http://twitter.com/raasdnil">tweets</a>.
 <% end %>
 
-<h3 class="section">Rails Guides Reviewers</h3>
-
 <%= author('Jaime Iniesta', 'jaimeiniesta', 'jaimeiniesta.jpg') do %>
   Jaime Iniesta works as a Ruby on Rails freelance developer since 2005. He's a member of <a href="http://www.prorubyteam.com">ProRuby</a>, co-founder of the <a href="http://srug.org">Spanish Ruby Users Group</a>, member of <a href="http://spainrb.org">Spain.rb</a>, and organizer of <a href="http://conferenciarails.org">Conferencia Rails</a> and <a href="http://euruko2009.org">EuRuKo 2009</a>. Jaime has a <a href="http://jaimeiniesta.com">blog</a> and <a href="http://twitter.com/jaimeiniesta">tweets</a>.
 <% end %>