The naming here is super confusing (and someone wasted a couple of hours because they didn't know that facet_components existed).
This change improves discoverability in 2 ways:
1 - More consistent naming by changint `components()` to `vertex_components()` which hints that there may exist a `facet_component()` function.
2 - Reference `facet_components()` in the docs for `vertex_components()` and vice versa
Former-commit-id: 43a7d250f5