Fix solutions/non_jrf/README.md

[skommala]

Fix the command terraform destroy -var-file=../solutions/common/tenancy.tfvars -var-file=../solutions/common/mp_byol.tfvars to terraform destroy -var-file=../solutions/common/tenancy.tfvars -var-file=../solutions/non_jrf/nonjrf_instance.tfvars

[skommala]

Its a bug. We are working on a fix.