[Templating] Explain the hinclude.js attributes

Author: javiereguiluz

templating/hinclude.rst

@@ -88,4 +88,16 @@ Or you can also specify a string to display as the default content:
 
     {{ render_hinclude(controller('...'), {default: 'Loading...'}) }}
 
+Use the ``attributes`` option to define the value of hinclude.js options:
+
+.. code-block:: twig
+
+    {# if set to true, cross-site Access-Control requests use credentials such
+       as cookies, authorization headers or TLS client certificates #}
+    {{ render_hinclude(controller('...'), {attributes: {data-with-credentials: 'true'}}) }}
+
+    {# if set to true and the contents include some JavaScript code, that code
+       is run immediately after loading the contents #}
+    {{ render_hinclude(controller('...'), {attributes: {evaljs: 'true'}}) }}
+
 .. _`hinclude.js`: http://mnot.github.io/hinclude/