WIP Group contributions in UI

app/utils/contribution-grouping-key.js

@@ -1,15 +1,12 @@
 import { isEmpty } from '@ember/utils';
 
-//
 // Derives a stable grouping key for a contribution, so that contributions
 // created for the same issue/pull request (one per contributor) can be
 // linked together in the UI.
 //
-// The bot writes the exact same `url` string (the html_url of the issue/PR)
-// into every per-contributor IPFS document for a given piece of work, so the
-// top-level `url` field on the model is sufficient as a grouping key. Manual
-// contributions without a URL return null and are treated as singletons.
-//
+// Until we have identical IPFS documents for different contributions, we will
+// use the URL as grouping key
+
 export default function contributionGroupingKey (contribution) {
   let url = contribution ? contribution.url : null;
   if (isEmpty(url)) return null;