Branch documentation titles

Hello,

The titles at the very top of version 2.7 and 2.8 on the website still claim
that they are the SVN head. 2.8 still even contains the warning that you should
find the branch documentation elsewhere because it is SVN Head's documentation.

See http://llvm.org/releases/2.8/docs/index.html
and http://llvm.org/releases/2.7/docs/index.html at the very top to see what I'm
talking about.

Thanks,

--Sam

Fixed. Thanks!

-bw