[VIM] broken Ubuntu advisory links

[Steven M. Christey]

Well, Ubuntu's jumped on the bandwagon of vendors who don't like to
keep security advisories in one place or at least use good redirection
(I know I'm a hypocrite for complaining since our web site redesign
accidentally broke stuff for a day or two, but we recovered quickly
:))

Links like this are now broken:

  http://www.ubuntulinux.org/support/documentation/usn/usn-327-1

instead use these:

  http://www.ubuntu.com/usn/usn-464-1

I don't know when this happened, probably a few months ago, but CVE
now has 350+ more broken links.  Yay!  I've got an inquiry into the
webmaster.

- Steve