net/netip: fix method name in {AddrPort,Prefix}.IsValid godoc
In CL 339309 these were probably copied from the respective
godoc comments in package inet.af/netaddr, also see
https://pkg.go.dev/inet.af/netaddr#IPPort.IsValid and
https://pkg.go.dev/inet.af/netaddr#IPPrefix.IsValid
In net/netip the methods are named Addr. Adjust the godoc comments
accordingly.
Change-Id: Icfe1d73b647c2e195d96cd5b1073a734905134af
Reviewed-on: https://go-review.googlesource.com/c/go/+/421995
Auto-Submit: Tobias Klauser <tobias.klauser@gmail.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com> Reviewed-by: Ian Lance Taylor <iant@google.com>
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