Fix typo and return function signature div.

Author: nharris-star2star

src/default_theme/section._

@@ -17,13 +17,14 @@
 
   <%= md(section.description) %>
 
+  <div class='pre p1 fill-light mt0'><%= signature(section) %></div>
   <% if (section.type) { %>
     <p>
       Type:
       <%= formatType(section.type) %>
     </p>
   <% } %>
-  <% if (section.arguments && section.augments.length) { %>
+  <% if (section.augments && section.augments.length) { %>
     <p>
       Extends
       <% if (section.augments) { %>