Fix HTML escaping in the guides

render :html escapes the argument if not provided as html safe.

guides/rails_guides/markdown.rb

@@ -158,7 +158,7 @@ module RailsGuides
         @view.content_for(:header_section) { @header }
         @view.content_for(:page_title) { @title }
         @view.content_for(:index_section) { @index }
-        @view.render(layout: @layout, html: @body)
+        @view.render(layout: @layout, html: @body.html_safe)
       end
   end
 end

guides/source/layout.html.erb

@@ -88,7 +88,7 @@
   <div id="container">
     <div class="wrapper">
       <div id="mainCol">
-        <%= yield.html_safe %>
+        <%= yield %>
 
         <h3>Feedback</h3>
         <p>