[1.7.x] Fixed #23855 -- Removed unnecessary all() in tutorial 3.

Backport of 8fce797830 from master

docs/intro/tutorial03.txt

@@ -409,7 +409,7 @@ rewritten:
 
 
     def index(request):
-        latest_question_list = Question.objects.all().order_by('-pub_date')[:5]
+        latest_question_list = Question.objects.order_by('-pub_date')[:5]
         context = {'latest_question_list': latest_question_list}
         return render(request, 'polls/index.html', context)