[Docs] Update logging section

[lonix1]

I found the "Turn off errors" config to be confusing. I'm not using express, so it doesn't apply in my case. Also I think it's for an older version of webpack.

With webpack 5, the old logging config is obsolete, we must use infrastructureLogging instead.

This works:

module.exports = {
  //...
  infrastructureLogging: {
    level: 'error',
  },
};

I'm using "error" rather than "none". But the output is the same in both cases anyway.

That docs section should be updated to show the config above, to avoid confusion. Thanks.