Add selected IP examples (ExampleIP(), Example_IP.Unmap(), etc)
Add selected IP examples (ExampleIP(), Example_IP.Unmap(), etc)

These helped me understand the finer details of netaddr.IP. They should
get rendered in the docs, like https://pkg.go.dev/inet.af/netaddr#IPSet

Signed-off-by: Alex Willmer <60c6d277a8bd81de7fdde19201bf9c58a3df08f4@moreati.org.uk>

go4org/netipx