doc: add syslog options to salvageserver man page

doc: add syslog options to salvageserver man page

Add the missing -syslog and -syslogfacility options to
the salvageserver man page.

Reviewed-on: http://gerrit.openafs.org/11816
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
(cherry picked from commit e4bae29efc3d370d1eaf6d954c63c324094c48e5)

Change-Id: I7501b801a49219a1a47d98516426661ad32a8102
Reviewed-on: http://gerrit.openafs.org/12112
Reviewed-by: Mark Vitale <mvitale@sinenomine.net>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>