fetch(9) -> ufetch(9). Remove reference to unimplemented ppi(9).

s/Xr store/Xr ustore/ to fix cross-references in these man-pages.

branches: 1.24.2;
Update manpages respond to isaki-audio2 branch.

Retire ipkdb entirely. The option was removed from the config files
yesterday.

ok kamil christos

Remove the X86PMC code I had written, replaced by tprof. Many defines
become unused in specialreg.h, so remove them. We don't want to add
defines all the time, there are countless PMCs on many generations, and
it's better to just inline the event/unit values.

branches: 1.21.2;
File system police.

Move the audio specification to section 9 under audio_system.

Ok wiz@

branches: 1.19.2;
Xref locking(9). Xref membar_ops(3), not mb(9).

branches: 1.18.2;
Remove references to cpu_swapout(9) and cpu_exit(9)

Those functions were removed several years back, discussed on tech-kern:
<http://mail-index.netbsd.org/tech-kern/2017/05/20/msg021913.html>

Remove reference to pathname(9), its man page was removed 10 years ago.

Update some xrefs to point to softint(9), not the old/alt spelling.

Fix typo, unless `ro raising' is something I don't know about.

branches: 1.14.6; 1.14.12;
Remove boilerplate in CODE REFERENCES on file paths.
Describe in intro(9) how to read paths in the CODE REFERENCES section.

branches: 1.13.2;
Remove references to the deprecated powerhook_establish(9).

Do not mention shutdownhook_establish(9) and doshutdownhooks(9), but
mention pmf(9) and pmf_system_shutdown(9), instead.

s/ctxsw/mi_switch/

Fix preamble

branches: 1.9.2;
kill bitmask_snprintf

Convert TNF licenses to new 2 clause variant

branches: 1.7.10; 1.7.12;
- kcont was removed.
- Replace some references to tsleep.

Fix some xrefs. Fix Dd argument. Remove superfluous Pps.

Introduce table of contents for core references. Please note, that in
future one should follow such hierarchy:
1. Table of contents (only intro.9)
2. Abstract description of subsystems (e.g. memoryallocators.9)
3. Concrete description of subsystem (e.g. vmem.9)

Thanks tsutsui@ for better structurization and wiz@ for quick review.
OK by tech-kern@ positivism.

s/ the the / the /

branches: 1.3.4;
macroize BSD, NetBSD, FreeBSD and misc cleanup

Reduce redundant 'describes'.

Introduction to kernel internals section.