Feature request: More natural display of cross-module anchors within the home module

[vdukhovni]

Missing haddock feature. Links to anchors in other modules don't have a sensible way to name the link within the module itself.

In the new Data.Foldable documentation, the doc comments above the class declaration refer to: "Data.Foldable#overview", which works well when displayed as Data.Foldable from other modules (e.g. Prelude), but in the home module (Data.Foldable) it looks rather unnatural. It would ideally be possible to specify alternative link text, specifically something like Overview in this case, rather than Data.Foldable.