Bum link on docs page

[Don Blaheta]

On the docs page for 2.6, the User manual link should go to

  http://lilypond.org/doc/v2.6/Documentation/user/lilypond/index.html

but it's currently missing the "Documentation" part.  (Likewise for the
other two user manual links, actually.)

-- 
-=-Don address@hidden<http://www.blahedo.org/>-=-
"Y'know, DMT is produced in a small but measurable amount in the human
brain. Should we make brains illegal as well? I know they won't be
missed over at the DEA."                                --Sam Walker