Fixed #23631 -- Removed outdated note on MySQL timezone support.

DateTime fields

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

MySQL does not have a timezone-aware column type. If an attempt is made to

store a timezone-aware ``time`` or ``datetime`` to a

:class:`~django.db.models.TimeField` or :class:`~django.db.models.DateTimeField`

respectively, a ``ValueError`` is raised rather than truncating data.

MySQL does not store fractions of seconds. Fractions of seconds are truncated

to zero when the time is stored.