Cannot create quic http/3 connection using URL

@jasnell
@nodejs

NodeJS versions: I did this in v27.0.0-pre, but it happens on any version that supports quic.
I noticed here this block of code, which was used as part of an example for an http/3 client:

const session = await connect('example.com:443', {
  // ALPN defaults to 'h3'.
  servername: 'example.com',
});
await session.opened;

If I try to call quic.connect(), whether I have the intention to use http/3 or raw quic, if I set the address parameter of the function to a URL instead of an IP address, it throws an error. But in the block of code I showed, it just uses 'example.com:443'. This can be a problem because some websites change the IP every few minutes, so then it would be mandatory to perform a DNS lookup.
Thank you

Start with the minimal HTTP/3 client example in doc/api/quic.md and reproduce the difference between an IP address and a URL passed to quic.connect(). Trace the connect entry point and related tests to determine whether URL input is supported or the example is incorrect. Done means the behavior and documentation agree, with coverage for the reported input if a code change is intended.