docs: underline that volume_iops works only if runner_worker_docker_machine_fleet.enabled = true

[kayman-mk]

Description

The runner_worker_docker_machine_instance.volume_iops does not work for the docker+machine driver, but works for the fleeting mode which can be enabled via runner_worker_docker_machine_fleet.enabled = true. We amend the comment to make that clear.

Closes #1179

[github-actions]

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