Fixed #22390 -- Doc'd possible server restart required in tutorial 6.

docs/intro/tutorial06.txt

@@ -74,9 +74,17 @@ Next, add the following at the top of ``polls/templates/polls/index.html``:
 
 The ``{% static %}`` template tag generates the absolute URL of static files.
 
-That's all you need to do for development. Reload
-``http://localhost:8000/polls/`` and you should see that the question links are
-green (Django style!) which means that your stylesheet was properly loaded.
+That's all you need to do for development.
+
+Start the server (or restart it if it's already running):
+
+.. console::
+
+    $ python manage.py runserver
+
+Reload ``http://localhost:8000/polls/`` and you should see that the question
+links are green (Django style!) which means that your stylesheet was properly
+loaded.
 
 Adding a background-image
 =========================