[1.5.x] Fixed a typo in docs/topics/auth/customizing.txt

    you should specify the custom model using the :setting:`AUTH_USER_MODEL`

    setting. For example::

        from django.conf import settings

        from django.db import models

        class Article(models.Model)

        class Article(models.Model):

            author = models.ForeignKey(settings.AUTH_USER_MODEL)

Specifying a custom User model