Added "nofollow" against docs link.

rest_framework/templates/rest_framework/base.html

@@ -33,7 +33,7 @@
         <div class="navbar-inner">
             <div class="container-fluid">
                 <span href="/">
-                    {% block branding %}<a class='brand' href='http://django-rest-framework.org'>Django REST framework <span class="version">{{ version }}</span></a>{% endblock %}
+                    {% block branding %}<a class='brand' rel="nofollow" href='http://django-rest-framework.org'>Django REST framework <span class="version">{{ version }}</span></a>{% endblock %}
                 </span>
                 <ul class="nav pull-right">
                     {% block userlinks %}