Description of problem:

https://docs.redhat.com/en/documentation/red_hat_satellite/6.15/html/administering_red_hat_satellite/using_webhooks_admin#webhooks-available-events_admin

https://docs.redhat.com/en/documentation/red_hat_satellite/6.16/html/administering_red_hat_satellite/using_webhooks_admin#webhooks-available-events_admin

We don't document the `failed` events and we also say the hooks will execute only if they are successful but that's not true. 

How reproducible:

100%

Is this issue a regression from an earlier version:

Hopefully 

Steps to Reproduce:

NA

Actual behavior:

We say:

~~~

The following table contains a list of webhook events that are available from the Satellite web UI. Action events trigger webhooks only on success, so if an action fails, a webhook is not triggered.
~~~

which is not 100% correct. 

The table also does not have the failed events or actions listed and explained. 

Expected behavior:

All available events and actions should be properly listed along with their descriptions. 

Business Impact / Additional info:

Wrong information results in confusions among the end-users about the availability of certain required events, leading to unnecessary delays