Windows: correct comments in cm_BkgStore

Windows: correct comments in cm_BkgStore

Reviewed-on: http://gerrit.openafs.org/5369
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Tested-by: Jeffrey Altman <jaltman@openafs.org>
(cherry picked from commit b6e5493437b942d5550247761dac3311c6d73a86)

Change-Id: I73c2fcab9ccff73e4419d3edf3ffc7395230e6e5
Reviewed-on: http://gerrit.openafs.org/6034
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@secure-endpoints.com>
Tested-by: Jeffrey Altman <jaltman@secure-endpoints.com>