canon: distinguish sector domains from project identity

canon/standards/contrib-templates/br-template.md

@@ -5,7 +5,7 @@ target_org: <github-org-or-owner>
 target_repo: <repository-name>
 title: "Short description of the bug"
 status: draft
-domain: custodian   # change to your domain
+domain: infotech    # select an allowed sector domain; do not use a legacy project name
 related_workstream: null
 state_hub_contribution_id: null
 created: "YYYY-MM-DD"