rewritten cmdHelp in accordance with the attached document in bug tdf#100836

Change-Id: I6453ee87039272388fe1bc0efd747dc706b570ff
Reviewed-on: https://gerrit.libreoffice.org/31244Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>
Tested-by: Mike Kaganski <mike.kaganski@collabora.com>