Add information about which stale group runners will be cleaned up
Details
Users have been reporting that they thought the setting to cleanup stale runners in a group would impact all runners they see, not just ones registered in that group.
Proposal
Include description text to clarify the scope of the cleanup.
A periodic background task deletes runners that haven't contacted GitLab in more than 3 months. Only runners registered in this group are deleted. Runners in subgroups and projects are not. [How many runners were deleted?](https://ux.gitlabdemo.cloud/help/ci/runners/configure_runners#view-stale-runner-cleanup-logs)
Edited by Gina Doyle