Use Lk macro instead of Pa when dealing with URLs, to produce links
with HTML output. And while here update or removed some dead URL
links. Another part of PR/29238.

branches: 1.32.2; 1.32.8;
Use .In instead of .Aq Pa for header files.

Bump date for newly added reference books.

Add two good (KAME) IPv6 books.

Fix the name of Tatuya Jinmei in the RFC reference.

Sync struct sockaddr_in6 with sys/netinet6/in6.h.

Consistently use 'RFC 1234' instead of 'RFC1234' or 'RFC-1234'.
From jmc@openbsd.

Use
.In header.h
instead of
.Fd #include \*[Lt]header.h\*[Gt]
Much easier to read and write, and supported by groff for ages.
Okayed by ross.

"Utilize" has exactly the same meaning as "use," but it is more
difficult to read and understand. Most manuals of English style
therefore say that you should use "use".

note that we intentionally violate RFC2553 for security reasons

reorder sentence for clarity

branches: 1.23.2;
Sync with headers: u_int16_t -> in_port_t.

Generate <>& symbolically. I'm avoiding .../dist/... directories for now.

Boring whitespace fixes.

update reference to sys/netinet6/IMPLEMENTATION

Improve usage of `comprise' according to Webster and misc/10893
by Jim Bernard.

English grammar fixups. Mostly adding articles (definite and indefinite),
with occasional corrections of number and suchlike. This shouldn't introduce
any semantic changes.

sync with recent kame.
- on AF_INET6, :: does not mean "local node"
- update draft/RFC revisions

sin6_family: u_int8_t -> sa_family_t.

typo. ftp(8) -> ftp(1)

typo

explicitly recommend listening to two sockets

document IPv4 mapped address issues (moved from inetd.8)

typo. there's no ttcp(4) in netbsd.

tiny nroff nit. correct order of sections. (sync with kame)

branches: 1.9.2;
fix unterminated sentence. remove space at EOL.

correct reference and example.

s/u_char/u_int8_t/ for sin6_{len,family}

improve scoped ip6 address issues.
refer ip6.4.

add NetBSD RCS ID. retain KAME RCS ID (quoted).

s/RFC2133/RFC2553/

document scoped address issues.

s/.Os KAME/.Os/

introductory manpage for IPsec and IPv6.