Alphabetized imports in various docs.

Follow-up of d97cce3409 and 7d3fe36c62.

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

@@ -38,8 +38,8 @@ many projects they are typically the most commonly used views.
 
     **Example myapp/views.py**::
 
-        from django.views.generic.detail import DetailView
         from django.utils import timezone
+        from django.views.generic.detail import DetailView
 
         from articles.models import Article
 
@@ -107,8 +107,8 @@ many projects they are typically the most commonly used views.
 
     **Example views.py**::
 
-        from django.views.generic.list import ListView
         from django.utils import timezone
+        from django.views.generic.list import ListView
 
         from articles.models import Article
 

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

@@ -15,8 +15,8 @@ editing content:
     Some of the examples on this page assume that an ``Author`` model has been
     defined as follows in ``myapp/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)
@@ -226,8 +226,8 @@ editing content:
 
     **Example myapp/views.py**::
 
-        from django.views.generic.edit import DeleteView
         from django.urls import reverse_lazy
+        from django.views.generic.edit import DeleteView
         from myapp.models import Author
 
         class AuthorDelete(DeleteView):