Removed 1.6 release note text regarding password limit length.

using non-string keys in ``request.session``. See the

:ref:`session_serialization` documentation for more details.

4096-byte limit on passwords

~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. note::

    This behavior was also added in the Django 1.5.4 and 1.4.8 security

    releases.

Historically, Django has imposed no length limit on plaintext

passwords. This enables a denial-of-service attack through submission

of bogus but extremely large passwords, tying up server resources

performing the (expensive, and increasingly expensive with the length

of the password) calculation of the corresponding hash.

Django now imposes a 4096-byte limit on password length, and will fail

authentication with any submitted password of greater length.

Miscellaneous

~~~~~~~~~~~~~