Include quic:// as an option for custom DNS server

When adding a custom DNS server, the possible DNS server address types hinted aren't reflective of what's accepted.

Include quic:// and another other possible missing protocols.

[Versty]

@gGkAC3qfszbdViFkw4Fk9ooS2u
Thanks! You have great attention to detail.
We will add info about quic:// to the DNS server address hint very soon.