[1.7.x] Fixed #22836 -- Linked tutorial05 to the right section of tutorial04.

Backport of 608aa8d101 from master

docs/intro/tutorial04.txt

@@ -233,6 +233,8 @@ First, open the ``polls/urls.py`` URLconf and change it like so:
         url(r'^(?P<question_id>\d+)/vote/$', views.vote, name='vote'),
     )
 
+.. _tutorial04-amend-views:
+
 Amend views
 -----------
 

docs/intro/tutorial05.txt

@@ -390,7 +390,7 @@ Improving our view
 The list of polls shows polls that aren't published yet (i.e. those that have a
 ``pub_date`` in the future). Let's fix that.
 
-In :doc:`Tutorial 4 </intro/tutorial04>` we introduced a class-based view,
+In :ref:`Tutorial 4 <tutorial04-amend-views>` we introduced a class-based view,
 based on :class:`~django.views.generic.list.ListView`:
 
 .. snippet::