ktool.c: Remove redundant HOWTO comment
ktool.c: Remove redundant HOWTO comment

No need to have this comment after the --help feature was updated
with a better explaining of each comand.

CESARBR/knot-service-source,CESARBR/knot-service-source,CESARBR/knot-service-source,CESARBR/knot-service-source,CESARBR/knot-service-source