docs: Update potentially misleading dind.md

[valchetski]

What does this PR do?

Update potentially misleading documentation. The updated text was taken from more accurate documentation for Java
https://java.testcontainers.org/supported_docker_environment/continuous_integration/dind_patterns/#docker-wormhole-pattern-sibling-docker-containers
Updated documentation has generic instruction for Docker Desktop and Docker Engine.

Why is it important?

In my case, I've used the example of the Docker Сompose file from current documentation, and it didn't work in our CI pipeline. Later I figured out we use Docker Engine, not Docker Desktop on the build server. Removed TESTCONTAINERS_HOST_OVERRIDE and all tests succeeded.

I think it'll be better to have generic documentation for Docker Engine and Docker Desktop and to emphasize that TESTCONTAINERS_HOST_OVERRIDE is needed only in the case of Docker Desktop (as documentation for Java does).

Related issues

• N/A

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[HofmeisterAn]

Hi 👋, thanks for the PR. I am happy to merge it. I just have one question regarding Docker Desktop and the environment variable TESTCONTAINERS_HOST_OVERRIDE. WDYT?

[HofmeisterAn]

Thanks ✔️.