Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

mdoc(7) police: Tidy up the syscall language.

Stop calling system calls "function calls".

Use "The .Fn system call" a-la "The .Nm utility".

When referring to a non-BSD implementation in
the HISTORY section, call syscall a function,
to be safe.

mdoc(7) police: Use the new .In macro for #include statements.

Add cross-references for the new kldsym(2) man page.

Unify SEE ALSO sections of the kld*.2 and mod*.2 manpages.
Previously, some useful xrefs were missing.
Now each of the pages refers to all remaining section 2 pages,
to the kld(4) page, and to a related utility's (section 8) page.

Remove whitespace at EOL.

mdoc(7) police: removed HISTORY info from the .Os call.

mdoc(7) police: sort SEE ALSO xrefs (sort -b -f +2 -3 +1 -2).

Prepare for mdoc(7)NG.

Add man pages for mod*(2). Shamelessly cut/pasted from the kld*(2) man
pages by Chris Costello.