[DOCS] Make example consistent by using .env file

[wyarde]

Updated the first example to make use of the .env file to paramterize the version. This I think makes it easier to move on to the second example where this principle is applied.

[cla-checker-service]

💚 CLA has been signed

[mergify]

This pull request is now in conflict. Could you fix it @wyarde? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch <remote-repo>
git checkout -b use_env_file_consistently <remote-repo>/use_env_file_consistently
git merge <remote-repo>/main
git push <remote-repo> use_env_file_consistently

[mergify]

This pull request does not have a backport label. Could you fix it @wyarde? 🙏
To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-/d./d is the label to automatically backport to the /d./d branch. /d is the digit
  NOTE: backport-skip has been added to this pull request.

[mergify]

This pull request is now in conflict. Could you fix it @wyarde? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch <remote-repo>
git checkout -b use_env_file_consistently <remote-repo>/use_env_file_consistently
git merge <remote-repo>/main
git push <remote-repo> use_env_file_consistently

[mergify]

This pull request is now in conflict. Could you fix it @wyarde? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch <remote-repo>
git checkout -b use_env_file_consistently <remote-repo>/use_env_file_consistently
git merge <remote-repo>/main
git push <remote-repo> use_env_file_consistently

[mergify]

This pull request is now in conflict. Could you fix it @wyarde? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch <remote-repo>
git checkout -b use_env_file_consistently <remote-repo>/use_env_file_consistently
git merge <remote-repo>/main
git push <remote-repo> use_env_file_consistently

[mergify]

This pull request is now in conflict. Could you fix it @wyarde? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch <remote-repo>
git checkout -b use_env_file_consistently <remote-repo>/use_env_file_consistently
git merge <remote-repo>/main
git push <remote-repo> use_env_file_consistently