volinfo: comments

Add doxygen style comment headers.

Reviewed-on: http://gerrit.openafs.org/4738
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
(cherry picked from commit 6b0ad5786d09446d6ecf723c892c11d6cce4493c)

Change-Id: I69165f41bcfc5aa5fcb94bcaad8d31b7a0349179
Reviewed-on: http://gerrit.openafs.org/11256
Reviewed-by: Chas Williams - CONTRACTOR <chas@cmf.nrl.navy.mil>
Reviewed-by: Andrew Deason <adeason@sinenomine.net>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>