9p goo.gl link

[Dr. David Alan Gilbert]

Hi,
  I noticed there was a goo.gl link in Documentation/filesystems/9p.rst

    * VirtFS: A Virtualization Aware File System pass-through
      http://goo.gl/3WPDg

Given goo.gl is going away, I was going to expand the link, but
the link looks fairly ill; it goes to a sciweavers.org site
that has an abstract, but it doesn't seem to download the full document.

I can see links to the document around, but I'm not sure if there's
a 'right' address.

Dave
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