[5.0.x] Fixed #28011 -- Corrected Field.hidden docs.

Backport of 7ba6c9edc50dc989fc5c306b541636249b952f93 from main

docs/ref/models/fields.txt

@@ -2500,18 +2500,11 @@ Attributes for fields
 
 .. attribute:: Field.hidden
 
-    Boolean flag that indicates if a field is used to back another non-hidden
-    field's functionality (e.g. the ``content_type`` and ``object_id`` fields
-    that make up a ``GenericForeignKey``). The ``hidden`` flag is used to
-    distinguish what constitutes the public subset of fields on the model from
-    all the fields on the model.
-
-    .. note::
-
-        :meth:`Options.get_fields()
-        <django.db.models.options.Options.get_fields()>`
-        excludes hidden fields by default. Pass in ``include_hidden=True`` to
-        return hidden fields in the results.
+    Boolean flag that indicates if a field is hidden and should not be returned
+    by :meth:`Options.get_fields()
+    <django.db.models.options.Options.get_fields>` by default. An example is
+    the reverse field for a :class:`~django.db.models.ForeignKey` with a
+    ``related_name`` that starts with ``'+'``.
 
 .. attribute:: Field.is_relation
 

docs/ref/models/meta.txt

@@ -79,10 +79,7 @@ Retrieving all field instances of a model
 
     ``include_hidden``
         ``False`` by default. If set to ``True``, ``get_fields()`` will include
-        fields that are used to back other field's functionality. This will
-        also include any fields that have a ``related_name`` (such
-        as :class:`~django.db.models.ManyToManyField`, or
-        :class:`~django.db.models.ForeignKey`) that start with a "+".
+        :attr:`hidden fields <django.db.models.Field.hidden>`.
 
     .. code-block:: pycon