Show which sublibrary is being depended on in detailed deps page

When looking at the [detailed dependency list of `haskell-language-server`](https://hackage.haskell.org/package/haskell-language-server-2.9.0.1/dependencies) or other multi-sublibrary packages that depend on each other, the current HTML doesn't give us insight into which specific sublibrary the dependency is on. Although there aren't many packages of this scale, I think it's still pretty useful if this feature request could be implemented!