add snippet to find running node

[WesHarrell]

https://github.com/nesi/hpc-intro/blob/1894d6958ca57f72c79e9b8f285153522a0472c5/_episodes/17-resources.md#L93-L93

[tkphd]

The message is sparse, but I agree that in the vicinity of 17-resources.md:93, we should add a scheduler-specific snippet demonstrating how to find the node a job is running on. This would require a relatively straight-forward extension of the last job submitted in Ep. 16 (perhaps with a sleep component) and the scheduler output commands introduced earlier in the lesson.