[3.0.x] Fixed #31342 -- Clarified docs about using base managers for …

…related objects.

Backport of 08a6215 from master

docs/topics/db/managers.txt

@@ -214,11 +214,13 @@ appropriate for your circumstances, you can tell Django which class to use by
 setting :attr:`Meta.base_manager_name
 <django.db.models.Options.base_manager_name>`.
 
-Base managers aren't used when querying on related models. For example, if the
-``Question`` model :ref:`from the tutorial <creating-models>` had a ``deleted``
-field and a base manager that filters out instances with ``deleted=True``, a
-queryset like ``Choice.objects.filter(question__name__startswith='What')``
-would include choices related to deleted questions.
+Base managers aren't used when querying on related models, or when
+:ref:`accessing a one-to-many or many-to-many relationship
+<backwards-related-objects>`. For example, if the ``Question`` model
+:ref:`from the tutorial <creating-models>` had a ``deleted`` field and a base
+manager that filters out instances with ``deleted=True``, a queryset like
+``Choice.objects.filter(question__name__startswith='What')`` would include
+choices related to deleted questions.
 
 Don't filter away any results in this type of manager subclass
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~