message: doc: correct logging rpc return type and example
diff: @@ -404,13 +404,13 @@ UniValue logging(const JSONRPCRequest& request)
  },
  RPCResult{
  "{ (json object where keys are the logging categories, and values indicates its status\n"
  - " \"category\": 0|1, (numeric) if being debug logged or not. 0:inactive, 1:active\n"
  + " \"category\": true|false, (bool) if being debug logged or not. false:inactive, true:active\n"
  " ...\n"
  "}\n"
  },
  RPCExamples{
  HelpExampleCli("logging", "\"[\\\"all\\\"]\" \"[\\\"http\\\"]\"")
  - + HelpExampleRpc("logging", "[\"all\"], \"[libevent]\"")
  + + HelpExampleRpc("logging", "[\"all\"], [\"libevent\"]")
  },
  }.ToString());
  }
  