Better document distinction between channel/chain monitor

[ConorOkus]

For some/many users, a unified API would be preferable. Abstraction layer might be convenient?

[TheBlueMatt]

ChainMonitor is the abstraction layer. I'm not entirely sure what's to be done here?

[ConorOkus]

Is there a preferred module to use here, as it seems like ChainMonitor & ChannelMonitor do quite similar things?

Opened this as there seemed to be confusion from one of our users, @arik-so any thoughts?

I'm happy to close if we feel it's a non issue.

[arik-so]

I think the confusion stems from the objects sounding so similar, even though they clearly refer to very different components. This is a hard one, but imo, definitely a big source of confusion.

[TheBlueMatt]

Hmm, they do sound somewhat similar. Some of the confusion may stem from the fact that we have a generic interface a user could implement, but they probably want to just use a ChainMonitor. Is https://lightningdevkit.org/architecture/ not clear on this matter, or should we increase visibility of that page?