Alphabetized imports in various docs.

Follow-up of d97cce3409 and 7d3fe36c62.

docs/topics/class-based-views/generic-display.txt

@@ -210,7 +210,7 @@ The default implementation simply adds the object being displayed to the
 template, but you can override it to send more::
 
     from django.views.generic import DetailView
-    from books.models import Publisher, Book
+    from books.models import Book, Publisher
 
     class PublisherDetail(DetailView):
 
@@ -409,8 +409,8 @@ custom view::
 Then we'd write our new view -- ``get_object`` is the method that retrieves the
 object -- so we simply override it and wrap the call::
 
-    from django.views.generic import DetailView
     from django.utils import timezone
+    from django.views.generic import DetailView
     from books.models import Author
 
     class AuthorDetailView(DetailView):

docs/topics/class-based-views/generic-editing.txt

@@ -99,8 +99,8 @@ First we need to add :meth:`~django.db.models.Model.get_absolute_url()` to our
 .. snippet::
     :filename: models.py
 
-    from django.urls import reverse
     from django.db import models
+    from django.urls import reverse
 
     class Author(models.Model):
         name = models.CharField(max_length=200)
@@ -115,8 +115,8 @@ here; we don't have to write any logic ourselves:
 .. snippet::
     :filename: views.py
 
-    from django.views.generic.edit import CreateView, UpdateView, DeleteView
     from django.urls import reverse_lazy
+    from django.views.generic.edit import CreateView, DeleteView, UpdateView
     from myapp.models import Author
 
     class AuthorCreate(CreateView):
@@ -150,7 +150,7 @@ Finally, we hook these new views into the URLconf:
     :filename: urls.py
 
     from django.urls import path
-    from myapp.views import AuthorCreate, AuthorUpdate, AuthorDelete
+    from myapp.views import AuthorCreate, AuthorDelete, AuthorUpdate
 
     urlpatterns = [
         # ...

docs/topics/class-based-views/mixins.txt

@@ -521,8 +521,8 @@ write our own ``get_context_data()`` to make the
 ``AuthorInterestForm`` available to the template. We'll skip the
 ``get_object()`` override from before for clarity::
 
-    from django.views.generic import DetailView
     from django import forms
+    from django.views.generic import DetailView
     from books.models import Author
 
     class AuthorInterestForm(forms.Form):
@@ -542,8 +542,8 @@ can find the author we're talking about, and we have to remember to set
 ``template_name`` to ensure that form errors will render the same
 template as ``AuthorDisplay`` is using on ``GET``::
 
-    from django.urls import reverse
     from django.http import HttpResponseForbidden
+    from django.urls import reverse
     from django.views.generic import FormView
     from django.views.generic.detail import SingleObjectMixin