`bdiv_distmat` clarification on the beta diversity metrics

Hi, I was wondering whether it would be possible to provide a better and more clear annotation on the different beta diversity metrics that are calculated using `bdiv_distmat`? For example, it is unclear what is calculated using option `bdiv = "Jaccard"`. Is it Jaccard similarity or dissimilarity? And how do the results change based on adding `weighted=TRUE` for Jaccard? My questions mainly stem from the way it is done in `vegan` as there weighted Jaccard is essentially Bray-Curtis, and it calculates Jaccard dissimilarity not similarity, which has been brought up as unclear for vegan by several people: https://github.com/vegandevs/vegan/issues/153