Fix issue where the second send fails on linux when using UDP.

[hydra]

• this occurs when using a local address for the destination, it may occur on other scenarios too.

This exampled, from tokio-rs/tokio#4996 demonstrates the root cause:

use tokio::net::UdpSocket;

#[tokio::main]
async fn main() {
    let socket =  UdpSocket::bind(("0.0.0.0", 12345)).await.unwrap();
    socket.connect(("127.0.0.1", 1122)).await.unwrap();
    socket.send(b"test 123").await.unwrap();  <-- succeeds
    socket.send(b"test 123").await.unwrap();  <-- fails
}

It was entirely non-obvious why that worked on Windows and on the Linux used by the raspberry Pi was using for testing didn't work on a new linux installation (Bazzite, Fedora 43 20260101 6.17.7-ba22.fc43.x86_64).

[Darksonn]

There's no guarantee it happens on the second send. See the Tokio issue.

[hydra]

Ok, yes, so perhaps the wording should be:

On Linux, /LATER/ calls to send /MAY/ cause a ConnectionRefused error when there is nothing listening and the source/destination are on the same host.

Thoughts? Improvements?

[okhsunrog]

This looks good to me. The rewording you proposed looks correct, just needs to be pushed.
Otherwise LGTM.