Update help for the `--otp` option in `ipa passwd` to actually explain its usage. Fixes: https://pagure.io/freeipa/issue/8244 Signed-off-by: Antonio Torres <antorres@redhat.com> Reviewed-By: Rob Crittenden <rcritten@redhat.com> Reviewed-By: Florence Blanc-Renaud <frenaud@redhat.com>