Fixed #19588 - Added create_superuser to UserManager docs.

.. class:: models.UserManager

    The :class:`~django.contrib.auth.models.User` model has a custom manager

    that has the following helper methods:

    that has the following helper methods (in addition to the methods provided

    by :class:`~django.contrib.auth.models.BaseUserManager`):

    .. method:: create_user(username, email=None, password=None)

    .. method:: create_user(username, email=None, password=None, **extra_fields)

        Creates, saves and returns a :class:`~django.contrib.auth.models.User`.

        :meth:`~django.contrib.auth.models.User.set_unusable_password()` will

        be called.

        See :ref:`Creating users <topics-auth-creating-users>` for example usage.

        The ``extra_fields`` keyword arguments are passed through to the

        :class:`~django.contrib.auth.models.User`'s ``__init__`` method to

        allow setting arbitrary fields on a :ref:`custom User model

        <auth-custom-user>`.

    .. method:: make_random_password(length=10, allowed_chars='abcdefghjkmnpqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ23456789')

        See :ref:`Creating users <topics-auth-creating-users>` for example usage.

        Returns a random password with the given length and given string of

        allowed characters. (Note that the default value of ``allowed_chars``

        doesn't contain letters that can cause user confusion, including:

    .. method:: create_superuser(self, username, email, password, **extra_fields)

        * ``i``, ``l``, ``I``, and ``1`` (lowercase letter i, lowercase

          letter L, uppercase letter i, and the number one)

        * ``o``, ``O``, and ``0`` (uppercase letter o, lowercase letter o,

          and zero)

        Same as :meth:`create_user`, but sets :attr:`~models.User.is_staff` and

        :attr:`~models.User.is_superuser` to ``True``.

Anonymous users