I have updated the documentation to provide information that meets the
code in the repository. The markdown file in this changeset passes
markdown lint and follows styling consistent with other markdown files
in the repository. The examples are correct and run successfully.

The Docker compose file is updated to run with the standard Docker
installation on Ubuntu 20.04. An environment variable was added to
ensure successful execution of the unit test.

The docker compose version in the validation directory is reverted back
to 3.9 per pell request comments.