Link to rtfd docs from example app.

apps/examples/templates/examples/home.html

@@ -8,7 +8,7 @@ <h1>
 {# L10n: This is a localizer comment #}
 <p>{{ _('This is a <em>test view</em>.') }}</p>
 <p>
-  {% trans docs_url='http://mozilla.github.com/playdoh/' %}
+  {% trans docs_url='http://playdoh.rtfd.org/' %}
   <a href="{{ docs_url }}">Learn you some Playdoh</a> and then go build
   something <strong>awesome</strong>.
   {% endtrans %}