github custom names recipient not working.

[jetersen]

The docs do not include how this should work. The reason for needing custom names is we have multiple GH orgs.

    subscriptions:
      - recipients:
          - slack:argocd_actions
        triggers:
          - on-deployed
          - on-health-degraded
          - on-sync-failed
          - on-sync-running
          - on-sync-status-unknown
          - on-sync-succeeded
      - recipients:
          - github.ghdevops
        selector: platform=true
        triggers:
          - on-deployed
          - on-sync-failed
          - on-sync-running