Docs feedback: provide specification for confusing fields/behavior in Webhook events
### Problem to solve
When you search for "Gitlab Webhook", you eventually end up on the page https://docs.gitlab.com/ee/user/project/integrations/webhook_events.html. On that page, there is one example for each of the events which a Webhook can be configured to report to a specified URL. However, there is no specification. For example, in [Pipeline events](https://docs.gitlab.com/ee/user/project/integrations/webhook_events.html#pipeline-events), it is unclear:
* What are the possible values of `status` and what do they mean? Specifically, what UI behavior in Gitlab do they correlate to? (green check mark, red cross, blue crescent moon symbol, etc.)
* What's the difference between `merge_request.id` and `merge_request.iid`?
* What exactly is meant by "only latest jobs". (I ended up looking in the changes of https://gitlab.com/gitlab-org/gitlab/-/merge_requests/53159 to understand this has to do with retries; my first thought was it would be related to stages)
### Further details
I reckon a full-blown specification may not be needed. However, some fields, especially enums, need extra information.
issue