Docserver: Update to the latest version of handlebar. Lots of re-syntaxifying.

chrome/common/extensions/docs/templates/articles/manifest/externally_connectable.html

 <h1>externally_connectable</h1>
 
 <p>
 The <code>externally_connectable</code> manifest property declares which extensions, apps, and web pages can connect to your {{platform}} via <a href="../runtime.html#method-connect">runtime.connect</a> and <a href="../runtime.html#method-sendMessage">runtime.sendMessage</a>.
 </p>
 
 <p>
 For a tutorial on message passing see <a href="../messaging.html#external">cross-extension and app messaging</a> and <a href="../messaging.html#external-webpage">sending messages from web pages</a>.
 </p>
 
@@ skipping 30 matching lines @@
     // <code>includeTlsChannelId</code> to <code>true</code> in
     // $ref:runtime.connect's connectInfo or $ref:runtime.sendMessage's options.
     "accepts_tls_channel_id": false
   },
   ...
 }
 </pre>
 
 <h2 id="reference">Reference</h2>
 <p class="api_reference">
-{{+partials.type @:apis.manifestTypes.byName.ExternallyConnectable}}
+{{+partials.type type:apis.manifestTypes.byName.ExternallyConnectable/}}
 </p>