Make the or-grouping of `only:variables` explicit in the doc
What does this MR do?
This MR improves clarity on the behaviour of the only:variables
config array in gitlab-ci. While other entries in job_control
make it obvious that the array is reduced with OR
, the variable section does not. This change might help people reading the doc "in anger" while fiddling with a job config.
Does this MR meet the acceptance criteria?
This is purely a doc upgrade, so the whole conformity checklist doesn't seem to be applicable here.
Edited by Clément Delafargue