docs(help): use formatters since useLevelLabels is deprecated

[arkerone]

Since useLevelLabels option is deprecated, we can use the formatters option with a level function to format the level.

[mcollina]

lgtm

[HengCC]

import pino from 'pino';
import { logURL, nodeName } from './config.js';

const logger = pino({
  level: "info",
  messageKey: "message",
  errorKey: "error",
  formatters: {
    level: (label) => {
      return { level: label }
    }
  },
  base: {
    APP_NAME: "xxxx,
    NODE_NAME: nodeName,
  },
  transport: {
    targets: [
      {
        target: 'pino-pretty',
        options: {
          colorize: true,
          singleLine: true,
        }
      },
      {
        target: 'pino-socket',
        options: {
          address: logURL,
          port: 5000,
          mode: 'tcp'
        },
      }
    ]
  }

});

export default logger;

this will cause an error , Error: option.transport.targets do not allow custom level formatters,

[github-actions]

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