Fix Kubernetes Executor docs
What does this MR do?
Fix Kubernetes Executor docs
Why was this MR needed?
See https://gitlab.com/gitlab-org/gitlab-runner/-/blob/v15.6.1/executors/kubernetes/log_processor.go#L46
Fix Kubernetes Executor docs
See https://gitlab.com/gitlab-org/gitlab-runner/-/blob/v15.6.1/executors/kubernetes/log_processor.go#L46