message: Document rescanblockchain returned stop_height being null
  Suggested
diff: @@ -3412,8 +3412,8 @@ UniValue rescanblockchain(const JSONRPCRequest& request)
  },
  RPCResult{
  "{\n"
  - " \"start_height\" (numeric) The block height where the rescan has started.\n"
  - " \"stop_height\" (numeric) The height of the last rescanned block.\n"
  + " \"start_height\" (numeric) The block height where the rescan started (the requested height or 0)\n"
  + " \"stop_height\" (numeric) The height of the last rescanned block. May be null in rare cases if there was a reorg and the call didn't scan any blocks because they were already scanned in the background.\n"
  "}\n"
  },
  RPCExamples{
  