[1.8.x] Fixed typos of "select_related" in docs and tests.

Backport of 7d363ed432 from master

docs/ref/models/querysets.txt

@@ -805,8 +805,8 @@ You can use ``select_related()`` with any queryset of objects::
 The order of ``filter()`` and ``select_related()`` chaining isn't important.
 These querysets are equivalent::
 
-    Entry.objects.filter(pub_date__gt=timezone.now()).selected_related('blog')
+    Entry.objects.filter(pub_date__gt=timezone.now()).select_related('blog')
-    Entry.objects.selected_related('blog').filter(pub_date__gt=timezone.now())
+    Entry.objects.select_related('blog').filter(pub_date__gt=timezone.now())
 
 You can follow foreign keys in a similar way to querying them. If you have the
 following models::

tests/defer/tests.py

@@ -109,13 +109,13 @@ class DeferTests(AssertionMixin, TestCase):
         self.assertEqual(obj.related_id, self.s1.pk)
         self.assertEqual(obj.name, "p1")
 
-    def test_defer_selected_related_raises_invalid_query(self):
+    def test_defer_select_related_raises_invalid_query(self):
         # When we defer a field and also select_related it, the query is
         # invalid and raises an exception.
         with self.assertRaises(InvalidQuery):
             Primary.objects.defer("related").select_related("related")[0]
 
-    def test_only_selected_related_raises_invalid_query(self):
+    def test_only_select_related_raises_invalid_query(self):
         with self.assertRaises(InvalidQuery):
             Primary.objects.only("name").select_related("related")[0]
 

tests/defer_regress/tests.py

@@ -219,7 +219,7 @@ class DeferRegressionTest(TestCase):
         self.assertEqual(obj.item, item2)
         self.assertEqual(obj.item_id, item2.id)
 
-    def test_proxy_model_defer_with_selected_related(self):
+    def test_proxy_model_defer_with_select_related(self):
         # Regression for #22050
         item = Item.objects.create(name="first", value=47)
         RelatedItem.objects.create(item=item)