Document when event handlers are triggered

[alanking]

@korydraughn - Do you recall what this issue means? I do not understand what is meant by "event handlers" being "triggered". Perhaps this was referring to the client-side "PEP"-like methods?

[korydraughn]

Yes. I was referring to the (client-side) PEPs in the ingest tool.

[alanking]

Actually, this is illuminating. The pre- and post-hook methods could be properly called the Event Handlers. The other event handler methods are more like... configuration, or behavioral modifiers, for a sync job. I'll update some wording in the documentation to reflect this.

[korydraughn]

Sounds good to me.