[plt-scheme] Error building docs for docs.plt-scheme.org and local copy

[Noel Welsh]

Hi all,

The docs on http://docs.plt-scheme.org/reference/ and in my local PLT
install all have a broken stylesheet.  The problem is the link to the
stylesheet is "../scribble.css", and that file doesn't exist.  Should
be just scribble.css methinks.

N.