Remove the last FIXME from the howto-release-Django doc.

This stuff starts about a week before the release; most of it can be done

any time leading up to the actual release:

#. If this is a security release, send out pre-notification **one week**

   before the release. We maintain a list of who gets these pre-notification

   emails at *FIXME WHERE?*. This email should be signed by the key you'll use

   for the release, and should include patches for each issue being fixed.

#. If this is a security release, send out pre-notification **one week** before

   the release. We maintain a list of who gets these pre-notification emails in

   the private ``django-core`` repository. This email should be signed by the

   key you'll use for the release, and should include patches for each issue

   being fixed.

#. As the release approaches, watch Trac to make sure no release blockers

   are left for the upcoming release.