doc: kdb manpage fixes

Add the missing -numeric and -long options.

Change-Id: I83776e64a161bc0a3ca9260944570799c506bbac
Reviewed-on: http://gerrit.openafs.org/10408
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>