Updated documentation for urls.py

I made a small change in the order of the documentation for urls.py. I feel it helps make it clear which lines you should add to the root settings.

rest_framework/urls.py

@@ -2,15 +2,15 @@
 Login and logout views for the browsable API.
 
 Add these to your root URLconf if you're using the browsable API and
-your API requires authentication.
-
-The urls must be namespaced as 'rest_framework', and you should make sure
-your authentication settings include `SessionAuthentication`.
+your API requires authentication:
 
     urlpatterns = patterns('',
         ...
         url(r'^auth', include('rest_framework.urls', namespace='rest_framework'))
     )
+    
+The urls must be namespaced as 'rest_framework', and you should make sure
+your authentication settings include `SessionAuthentication`.
 """
 from __future__ import unicode_literals
 from rest_framework.compat import patterns, url