actual directories under /doc. This broke inter-document links if
you started at http://www.freebsd.org/{FAQ,handbook}, instead of the
longer .../doc/en_US.ISO8859-1/books/{faq,handbook}, and has caused a
steady stream of complaints to -doc.
Instead, have a static index.html in both those directories with a
http-equiv="refresh" that points people to the right place.
Adjust the build process to take account of this.
