improves html structure for comments on debates and proposals

app/views/proposals/show.html.erb

@@ -6,8 +6,7 @@
             social_description: @proposal.summary %>
 <% end %>
 <% cache [locale_and_user_status(@proposal), @proposal, @proposal.author, Flag.flagged?(current_user, @proposal), @proposal_votes] do %>
-
-  <section class="proposal-show">
+  <div class="proposal-show">
     <div id="<%= dom_id(@proposal) %>" class="row">
       <div class="small-12 medium-9 column">
         <%= render "shared/back_link" %>
@@ -134,7 +133,7 @@
         </div>
       </aside>
     </div>
-  </section>
+  </div>
 <% end %>
 
 <div class="tabs-content" data-tabs-content="example-tabs">