docs(faq): remove faq ipv6

[AbdelrahmanHafez]

We added this question due to #6566

This is fixed in the driver somewhere along the way, and we don't need to manually use family: 4 anymore.

const mongoose = require('mongoose');

run().catch(console.error);

async function run() {
  const before = Date.now();
  await mongoose.connect('mongodb://localhost:27017/test');
  console.log(`Connected in: ${Date.now() - before}ms.`);
}

Output:

Connected in: 22ms.

[vkarpov15]

Great, thanks 👍

[AbdelrahmanHafez]

Happy to help 👍