netaddr: consistently use %q for func arguments in t.Errorf
netaddr: consistently use %q for func arguments in t.Errorf

Also, s/is4in6/Is4in6/

Signed-off-by: Tobias Klauser <9249c549618448e4c699e8032ba6c7f0d7fd4b7f@distanz.ch>

go4org/netipx