build-sys: make docbook path find easier to read

Additional gain, when horizontal lists are converted to vertical, is that
each item will be individually version controlled.

Change-Id: I4f12efac9c3d828fafdc7ab8a15740cfb0276538
Reviewed-on: http://gerrit.openafs.org/10014
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>