config/network: Also change the link to supervise symlink

[vincele]

In the section talking about interface-specific dhcpcd, the run script is modified with sed to have the proper interface name, but there is also the supervise symlink, pointing into /run/runit.

The target is "supervise.dhcpcd-eth0", which kind of works as-is, until you also have an actual eth0 interface that is handled by a dhcpcd supervised by runit.

So to avoid having this misleading symlink, change it to a proper target: "supervise.dhcpcd-enp3s0" in the sample code.

[vincele]

And just after creating the PR, I see the related #839, which is another take on the same subject...