Alphabetized imports in various docs.

Follow-up of d97cce3409 and 7d3fe36c62.

docs/intro/overview.txt

@@ -69,7 +69,7 @@ necessary:
 .. code-block:: python
 
     # Import the models we created from our "news" app
-    >>> from news.models import Reporter, Article
+    >>> from news.models import Article, Reporter
 
     # No reporters are in the system yet.
     >>> Reporter.objects.all()

docs/intro/tutorial02.txt

@@ -383,7 +383,7 @@ the Python import path to your :file:`mysite/settings.py` file.
 
 Once you're in the shell, explore the :doc:`database API </topics/db/queries>`::
 
-    >>> from polls.models import Question, Choice   # Import the model classes we just wrote.
+    >>> from polls.models import Choice, Question  # Import the model classes we just wrote.
 
     # No questions are in the system yet.
     >>> Question.objects.all()
@@ -469,7 +469,7 @@ the :doc:`time zone support docs </topics/i18n/timezones>`.
 Save these changes and start a new Python interactive shell by running
 ``python manage.py shell`` again::
 
-    >>> from polls.models import Question, Choice
+    >>> from polls.models import Choice, Question
 
     # Make sure our __str__() addition worked.
     >>> Question.objects.all()

docs/intro/tutorial04.txt

@@ -69,8 +69,8 @@ create a real version. Add the following to ``polls/views.py``:
 .. snippet::
     :filename: polls/views.py
 
+    from django.http import HttpResponse, HttpResponseRedirect
     from django.shortcuts import get_object_or_404, render
-    from django.http import HttpResponseRedirect, HttpResponse
     from django.urls import reverse
 
     from .models import Choice, Question
@@ -262,8 +262,8 @@ views and use Django's generic views instead. To do so, open the
 .. snippet::
     :filename: polls/views.py
 
-    from django.shortcuts import get_object_or_404, render
     from django.http import HttpResponseRedirect
+    from django.shortcuts import get_object_or_404, render
     from django.urls import reverse
     from django.views import generic
 

docs/intro/tutorial05.txt

@@ -171,8 +171,8 @@ Put the following in the ``tests.py`` file in the ``polls`` application:
 
     import datetime
 
-    from django.utils import timezone
     from django.test import TestCase
+    from django.utils import timezone
 
     from .models import Question