1. 4-to-6 -> 6-to-4
2. Remove reference to A6 Records
3. Reference more IPv6 software (DJBDNS, Konq, Epiphany)
4. Fix wording about abbreviating with ::
5. Fix wording about autoconfiguration WRT MAC addresses
6. Add link to RFC3068

PR: docs/67821
Submitted by: Brad Davis <so14k@so14k.com>
Reviewed by: Harold Gutch