message: docs: improve. add load-on-demand.md, improve how-umi-works.md
diff: @@ -240,7 +240,7 @@ export function printFileSizes(stats: webpack.Stats, dir: string) {
  );
  console.log(
  chalk.yellow(
  - 'Consider reducing it with code splitting: https://umijs.org/guide/code_splitting',
  + 'Consider reducing it with code splitting: https://umijs.org/docs/load-on-demand',
  ),
  );
  console.log(
  