[BUG] :bug: broken link in `getting-started/local-exec/single-command/README.md`

[tungbq]

Broken link in https://github.com/tungbq/aws-lab-with-terraform/blob/main/getting-started/local-exec/single-command/README.md

We need to check and correct this.

The correct link for terraform guideline is - https://github.com/tungbq/aws-lab-with-terraform/blob/main/TERRAFORM-GUIDE.md