Update docker.cfg

[doctore74]

Extended the comments and added the option for "combined" in the docker.cfg example file

General information

Missing information about an additional option in the configuration was added.

Bug reports

no bug

Proposed changes

Just adding information as comment in the docker.cfg file. No code change.

[github-actions]

All contributors have signed the CLA ✍️ ✅
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[doctore74]

I have read the CLA Document and I hereby sign the CLA or my organization already has a signed CLA.

[doctore74]

recheck

[github-actions]

Thank you for your contribution. This pull request has been marked as stale as it has not passed the automated tests and there was no activity for the last 14 days.
Please take a look at the ‘Checks’ section for details on the test results and make the necessary changes.

This pull request will be closed due to inactivity after 60 days, if no action is taken.

[github-actions]

Thank you for your contribution. This pull request has been marked as stale as it has not passed the automated tests and there was no activity for the last 14 days.
Please take a look at the ‘Checks’ section for details on the test results and make the necessary changes.

This pull request will be closed due to inactivity after 60 days, if no action is taken.