message: doc: 0.18: Remove TODO from release notes
diff: @@ -502,16 +502,6 @@ Network
  the `setban` RPC, all connections from that peer will still be
  rejected.
  -- When fetching a transaction announced by multiple peers, previous
  - versions of Bitcoin Core would sequentially attempt to download the
  - the transaction from each announcing peer until the transaction is
  - received, in the order that those peers' announcements were received.
  - In this release, the download logic has changed to randomize the fetch
  - order across peers and to prefer sending download requests to outbound
  - peers over inbound peers.
  -
  -(TODO pieter: perhaps mention orphan tx handling from #14626)
  -
  Wallet
  -------
  