Rename unreleased watcher ext methods slightly

[clux]

as suggested by #899 (review)

the longer name here i think reads better than a short applied because it is sometimes a bit weird to have stuff like:

reflector(x,y).applied().boxed()

makes applied be possible to interpret as some sort of functional transformer

[jesperpedersen]

.targets() ? Don't know if that is better though...

[clux]

.targets() ? Don't know if that is better though...

Probably not. We need to distinguish between applied objects and touched objects.
Anyway, actual agreement on this. Going to merge after if stuff passes after small doc updates.

[clux]

Marking this as exclude because it's not a breaking change if it hasn't been released yet 🙃