update help on transformation CLI

Change-Id: If2994c47b17409a1d667af0c587bebbd5f8b8d7d
Reviewed-on: http://gerrit.esdi-community.eu/3201
Reviewed-by: Simon Templer <simon.templer@igd.fraunhofer.de>
Tested-by: Simon Templer <simon.templer@igd.fraunhofer.de>