Merge pull request #271 from lektor/lektor/lektor-643

Changed use of iteritems to items in data bag docs

content/docs/content/databags/contents.lr

@@ -26,7 +26,7 @@ And the template could access it like this:
 
 ```html+jinja
 <ul class="nav">
-{% for path, label in bag('main-nav').iteritems() %}
+{% for path, label in bag('main-nav').items() %}
   <li{% if this.is_child_of(path) %} class="active"{% endif
     %}><a href="{{ path|url }}">{{ label }}</a>
   </li>