Timeout behaviour clarification

[abridgett]

I'm a concourse newbie, reading the docs - very thorough :-) It's not 100% clear to me what happens upon a timeout (I was going to submit a PR but wasn't sure I had the details right):

https://concourse-ci.org/timeout-step-modifier.html vs
https://concourse-ci.org/on-error-step-hook.html

In particular the phrase same semantics as aborting (except the build will be failed not aborted). So if I understand this correctly the on_abort modifiers will be triggered, but not the on_failure. Though on the UI it'll show as failed not aborted?