DOC: vos convertROtoRW security requirements

DOC: vos convertROtoRW security requirements

They were copied from another command; corrected them.

Reviewed-on: http://gerrit.openafs.org/7305
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Michael Meffie <mmeffie@sinenomine.net>
Reviewed-by: Ken Dreyer <ktdreyer@ktdreyer.com>
Reviewed-by: Andrew Deason <adeason@sinenomine.net>
Reviewed-by: Derrick Brashear <shadow@dementix.org>
(cherry picked from commit a2f523b50592e261fe9cd3ef32978e786011c3c7)

Change-Id: I03101cec5bfd20555e33f639ce2c08cde873d646
Reviewed-on: http://gerrit.openafs.org/7494
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementix.org>