TESTCONTAINERS_HOST_OVERRIDE is documented but not implemented

[mdelapenya]

          I'm running into similar issue. I'm following https://golang.testcontainers.org/system_requirements/ci/gitlab_ci/#example-using-docker-socket and so far it doesn't seem to work. Is the `TESTCONTAINERS_HOST_OVERRIDE` variable implemented?

Originally posted by @arvenil in https://github.com/testcontainers/testcontainers-go/issues/1373#issuecomment-1938564264

We should remove those references and update to the most updated ones.

[shotmk]

Documentation is pointing to a wrong TESTCONTAINERS_HOST_OVERRIDE. TC_HOST should be used. Documentation should be fixed.

[mdelapenya]

@shotmk thanks for adding context to the issue, would you like to contribute it? 🙏