Docserver: Fix a bug where API properties were not showing their type.

chrome/common/extensions/docs/templates/private/api_property.html

 <div>
   <h3 id="{{id}}">{{name}}</h3>
   <div class="summary">
     <div class="line">{{+partials.api_namespace api:api}}{{name}}</div>
   </div>
   <div>
-    <dt><span class="property">{{name}}</span> {{+partials.type_name link:link}}</dt>
+    <dt><span class="property">{{name}}</span> {{+partials.type_name link:link @:property}}</dt>
     {{?description}}<dd>
       {{{description}}}
     </dd>{{/description}}
     {{?properties}}
     <h4 id="{{property.name}}-properties">
       Properties of <a href="#property-{{property.name}}">{{property.name}}</a>
     </h4>
     <dd><dl>{{#properties}}
       {{+partials.parameter_full}}
     {{/}}</dl></dd>
     {{/properties}}
     {{?functions}}
     <h4 id="{{property.name}}-functions">
       Methods of <a href="#property-{{property.name}}">{{property.name}}</a>
     </h4>
     <dd><dl>{{#functions}}
       {{+partials.function @:@}}
     {{/}}</dl></dd>
     {{/functions}}
   </div>
 </div>